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To brew kombucha at home, you need sweet tea, enough active starter liquid, a healthy SCOBY, a clean glass fermenter, a breathable cloth cover, and 7 to 10 days in a warm spot. The first ferment should turn sweet tea into a tart kombucha base. Bottling and fizz come later, during second fermentation. Many first batches fail because the starter liquid is too weak, the tea is too hot, the jar is dirty, the room is too cold, or the brewer bottles before the first ferment has done its job.
Good Brew in Brunswick works with raw, living kombucha and home-brew supplies every day. This guide is written for a first batch, not for a perfect Instagram ferment. The aim is simple: get a safe, drinkable base brew first, then learn flavour and fizz after that.
A kombucha brewing setup is a simple first-ferment station: a live culture, sweet tea, a clean glass vessel, airflow, and a way to check that the brew is moving in the right direction. You do not need a complicated kitchen lab, but you do need the basics to be clean, active, and matched to the batch size.
| Item | Why it matters | Good Brew link |
|---|---|---|
| SCOBY and starter liquid | Starts fermentation and helps acidify the batch early. | SCOBYs and brewing kits |
| Sweet tea | Feeds the culture during first fermentation. | COMPLETE Homebrew Kombucha Kit |
| Glass fermenter | Holds the first ferment and makes repeat brewing easier. | Glass Fermenter with Tap 8L |
| Breathable cloth | Keeps fruit flies and dust out while allowing airflow. | Breathable Fermentation Cloth |
| pH strips or meter | Helps check that acidity is moving in the right direction. | Book Of 80 Paper pH Testing Strips or Digital pH Meter |
| Bottles | Used after first fermentation for second fermentation. | 24 Washed Glass Bottles or containers and bottles |
| Thermometer | Helps avoid cold stalls and hot-tea mistakes. | Stick-on Thermometer |
A SCOBY is a symbiotic culture of bacteria and yeast. It works with active starter liquid to ferment sweet tea into kombucha. The starter liquid matters because it helps acidify the brew early, which gives the culture a better start.
The simple kombucha recipe for a first batch
A first-batch kombucha recipe should be kept plain. Start with sweet tea, cool it fully, add the SCOBY and starter liquid, then let the first ferment finish before you think about fruit, ginger, herbs, or sealed bottles.
| Ingredient | First-batch guide | Why it matters |
|---|---|---|
| Water | 1 litre to start with a 220ml starter | Keeps the first batch small enough for the starter strength. |
| Tea | 5g green or oolong tea per litre | Provides the tea base the culture ferments. |
| Sugar | 50g raw sugar per litre | Feeds the yeast and bacteria. Much of it is changed during fermentation. |
| Starter liquid and SCOBY | Use the full starter pack supplied with the SCOBY | Brings active culture and acidity into the new batch. |
| Time | Start checking at 7 days | Timing depends on room temperature and taste. |
Good Brew lists a recipe ratio of 5g tea and 50g sugar per litre of finished kombucha. Its SCOBY starter page also gives a first-batch guide using 1 litre of water, 5g of green or oolong tea, and 50g of sugar. Treat that as a starting point, then follow the instructions that come with your exact SCOBY or kit.
For a first batch, the process is:
- Boil the water and steep the tea.
- Stir in the sugar while the tea is hot so it dissolves fully.
- Let the sweet tea cool. It must not be hot when it touches the SCOBY or starter liquid.
- Add the SCOBY and starter liquid to the fermenter.
- Pour in the cooled sweet tea.
- Cover the fermenter with a breathable cloth and secure it with a rubber band.
- Keep the brew in a stable warm spot, away from direct sunlight.
- Start tasting after about a week.
- Save enough finished kombucha as starter liquid for the next batch.
Never add a SCOBY or starter liquid to hot tea. Heat can damage or kill the culture, and a weak culture is one of the easiest ways to lose the batch.
First fermentation is where most beginners go wrong
Good Brew recommends keeping kombucha in the 23 to 29 degrees Celsius range for best brewing. A colder kitchen slows the culture. A very warm spot can push the flavour sour faster and may create more risk if the brew is weak or dirty. The brew should also stay out of direct sunlight.
Seven to 10 days is a useful guide, not a promise. A batch can move faster in warm weather and slower in winter. Taste is part of the check, but it is not the only check. Clean setup, active starter liquid, normal surface growth, and steady acidification all matter.
| What you see or taste | What it usually means | What to do |
|---|---|---|
| Still very sweet after a week | The brew is cold, young, or weak. | Give it more time and move it to a steadier warm spot. |
| New pale film forming on top | Often normal SCOBY growth. | Leave it alone unless it becomes fuzzy or coloured. |
| Sharp vinegar taste | It has fermented too long or too warm for your taste. | Shorten timing next batch or use this batch like vinegar. |
| Fruit flies near the jar | The cloth is loose or the cover is not fine enough. | Check the cover, do not let insects reach the brew. |
| Fuzzy blue, green, grey, brown, or black growth | Likely mould. | Discard the batch. Do not drink it. |
Clean the jar, hands, cloth, and tools well before you begin. You do not need to treat your kitchen like a hospital room, but fruit flies, mould spores, and dirty utensils can ruin a first batch quickly.
How do you know when kombucha is ready to bottle?
Kombucha is usually ready to bottle when it tastes tart but still drinkable, no longer tastes like sweet tea, shows no mould, and has enough acidity for the brew to feel clearly fermented. The first ferment should taste like young kombucha, not like sweet iced tea.
pH strips or a digital pH meter can help new brewers build confidence. Good Brew sells Book Of 80 Paper pH Testing Strips and a Digital pH Meter for brewers who want a simple acidity check. Do not rely on pH alone if the brew smells rotten, looks fuzzy, or has clearly been contaminated.
Before bottling, keep at least some finished kombucha aside as starter liquid for the next batch. A common beginner mistake is bottling the whole batch, then having nothing strong enough to start the next ferment.
Second fermentation is a separate step
Second fermentation is the sealed-bottle stage that builds fizz and flavour. First fermentation makes the kombucha base. Second fermentation happens after that, once the base has become tart and drinkable.
For second fermentation, brewers usually add fruit, juice, herbs, spices, ginger, or a little extra sugar to sealed bottles. The remaining yeast and bacteria keep working, which can build carbonation. That is why the bottle setup matters. Weak, unsuitable, or overfilled bottles can create pressure problems.
Keep this part simple for your first batch. Bottle only when the first ferment is ready, leave some headspace, use bottles suited to sealed fermented drinks, and open carefully. For the full fizz and flavour process, use Good Brew’s second fermentation article.
Troubleshooting your first kombucha batch
First-batch kombucha problems usually come from temperature, time, starter strength, cleanliness, or bottling too early. The table below gives a practical starting point.
| Problem | Likely cause | What to do next |
|---|---|---|
| It is still too sweet | Too cold, too little time, or weak starter. | Give it more time, move to a warmer stable spot, and check starter strength next batch. |
| It tastes like vinegar | It fermented too long or too warm. | Use it for vinegar-style kombucha, then shorten the next batch. |
| It smells rotten or cheesy | Possible contamination. | Do not drink it. Clean the gear and replace the culture if needed. |
| There is fuzzy growth on top | Possible mould. | Discard the batch and review the process. |
| Bottles stay flat | Bottling too early, too little sugar, cool room, or poor bottle seal. | Read the second fermentation guide and check your bottle setup. |
| It looks cloudy or stringy stay flat | Often normal yeast activity. | Compare with normal SCOBY signs and check smell, taste, and surface growth. |
When in doubt, do not drink a batch that looks or smells wrong. Fuzzy surface growth is not a scrape-it-off problem. Discard the batch, review the process, and replace the culture if needed.
Should you buy a kit or put the pieces together yourself?
A kombucha brewing kit is usually the better choice for a first-time brewer because the fermenter, cloth, pH strips, tea, sugar, SCOBY, and instructions are already matched. That removes a lot of the guesswork from the first batch.
Good Brew’s COMPLETE Homebrew Kombucha Kit includes a SCOBY with instructions, organic raw sugar, organic green tea, fermentation cloth, an 8L glass fermenter, and pH papers. A 100% organic Kombucha SCOBY Brewing Starter Kit can be enough if you already have the right jar, cloth, bottles, and process.
| Option | Best for | What to check |
|---|---|---|
| Complete kit | First-time brewers who want fewer setup errors. | Kit contents, fermenter size, pH strips, cloth, and included instructions. |
| SCOBY starter kit | People who already own the right jar and cover. | Enough starter liquid, clean vessel, and safe brewing process. |
| Bottled kombucha | People who like kombucha but do not want a weekly routine. | Choose a live, well-made drink that suits your taste. |
| Workshop | Brewers who want someone to check the process in person. | Confirm current dates before publishing or booking. |
The best choice depends on what you want from the habit. If you drink kombucha often, home brewing can make sense after the kit cost. Good Brew’s cost breakdown explains the break-even point in more detail. If you only want a few bottles now and then, ready-to-drink kombucha may be the simpler answer.
Where to go next after your first batch
Once the first ferment makes sense, the next step depends on what problem you are trying to solve.
- Ready to start: browse Good Brew’s SCOBYs and brewing kits.
- Already have the first ferment working: read the second fermentation article before chasing fizz.
- Need bottles or a larger jar: check the containers and bottles range.
- Not sure if home brewing is worth it: compare the numbers in the cost breakdown.
- Want hands-on help: check the workshops page and confirm the next Brunswick session before booking.
- Prefer ready-to-drink kombucha: choose bottled kombucha or look at Good Brew subscriptions.
Do not rush the first batch. A steady first ferment gives you a better starter for the next brew, a cleaner base for flavouring, and fewer flat or over-pressurised bottles later.
Common questions about brewing kombucha at home
How long does kombucha take to brew at home?
Kombucha often takes 7 to 10 days for the first ferment, but temperature and starter strength change the timing. Start tasting after about a week, then bottle once it tastes tart and no longer tastes like sweet tea.
Can I make kombucha without a SCOBY?
You need an active culture to brew kombucha reliably. A SCOBY plus strong starter liquid is the usual method. Using only a random bottle of kombucha as starter is less reliable, especially if it is pasteurised, flavoured, or not active.
How much starter liquid do I need for kombucha?
Good Brew’s older how-to page says to keep culture liquid to water at a ratio of 1:5 at the most. For a 220ml starter, that means starting around 1 litre of sweet tea, then building up once the culture is active.
Why did my first kombucha batch go mouldy?
A mouldy batch can come from weak starter liquid, a dirty jar, poor cloth coverage, fruit fly contamination, or a room that is too cold for too long. If you see fuzzy growth, discard the batch and do not reuse the SCOBY.
Is homemade kombucha cheaper than buying it?
Home brewing can be cheaper if you drink kombucha often and keep brewing after the first kit. Good Brew’s cost article estimates that its complete kit pays for itself after roughly 7 to 10 litres of home brew, depending on what you would otherwise buy.
When should I bottle kombucha?
Bottle kombucha after the first ferment has become tart and drinkable. Do not bottle when it still tastes like sweet tea, and do not bottle a brew with mould, rotten smells, or signs of contamination.