By ShowMeStepByStepPublished Updated
Based on a video by LifebyMikeG.
Store-bought kombucha runs four or five dollars a bottle. Make it yourself and the cost drops to pennies per glass once the SCOBY is paid for. The brewing process is also dead simple: make sweet tea, drop in a SCOBY, wait a week, bottle it. That is the whole craft.
This guide walks through both fermentations - the 7 to 10 day first fermentation that turns sweet tea into tangy kombucha, and the optional 2 to 3 day second fermentation that adds flavor and natural carbonation. Mike from LifebyMikeG demonstrates the exact ratios for a 2-gallon batch in glass, including how to source a SCOBY, what the brew should look like when it is ready, and how to bottle for fizz without exploding bottles. The whole production cycle takes about 10 days and costs roughly $5 per gallon after the one-time SCOBY purchase, compared to $40+ for the same volume from the store.
Why people switch to home brewing: cost control, sugar control (you decide how much residual sugar by adjusting the first fermentation time), and flavor freedom (the second fermentation lets you experiment with ginger, berries, herbs, citrus, anything in your kitchen). Homemade kombucha contains trace alcohol from fermentation, usually under 0.5%, which is the same legal threshold as commercial non-alcoholic kombucha. If alcohol content matters for any reason, keep first fermentation under 10 days and skip the second fermentation.
If you are new to fermented drinks, kombucha is one of the easiest to start with. It is more forgiving than water kefir, faster than ginger beer, and the SCOBY is a visible, tactile indicator that something is happening - much easier to read than the invisible bacterial activity in something like sourdough. For other "make it at home" cooking basics, check out how to make iced tea, how to cook quinoa, and how to make overnight oats.
The biggest mistake first-time brewers make is impatience - opening the jar, moving it around, or checking on the SCOBY constantly. The second biggest is using chlorinated tap water (chlorine kills the SCOBY) or hot tea (heat kills the SCOBY). Both are easy to avoid once you know to watch for them. Follow the 8 steps below in order, give it the full 7 to 10 days, and you will have your first batch of kombucha cheaper, fresher, and more customized than anything on a grocery shelf.
| Factor | Homemade | Store-Bought |
|---|---|---|
| Cost per gallon | ~$5 (after SCOBY) | ~$40-50 |
| One-time SCOBY cost | $7-15 (or free from a friend) | N/A |
| Sugar control | Full control (fermentation time) | Whatever the brand chose |
| Flavor options | Anything you put in the bottles | Limited to brand offerings |
| Time per batch | ~10 days, ~30 min hands-on | Grab off shelf |
| Probiotic content | Live, active cultures | Live in fresh bottles, less in aged |
| Alcohol content | ~0.5%, can manage with timing | <0.5% (regulated) |
| Shelf life | 6-12 months sealed in fridge | 30-90 days from production date |
About 10 days total from start to finish. The first fermentation takes 7 to 10 days at 66 to 78 degrees Fahrenheit. The optional second fermentation (where carbonation builds) adds another 2 to 3 days. Hands-on time across the whole cycle is roughly 30 minutes.
Yes, but black tea is more forgiving for beginners. Green tea ferments faster and can over-acidify if you forget about it. Mixed black-and-green tea blends are popular once you have a few batches under your belt. Avoid flavored teas, decaf teas, and anything with oils (Earl Grey, chai) - the additives weaken the SCOBY over multiple batches.
The only true sign of a bad batch is mold on the SCOBY surface - blue, green, black, or red fuzzy patches. Stringy bits, dark spots inside the SCOBY, and a sharp vinegary smell are all normal. If you see actual fuzz, throw out the entire batch (SCOBY included) and start over with a new culture. Mold is rare if you used the right amount of starter liquid and clean equipment.
Yes, as long as there is no mold and the pH stays between 2.5 and 3.5 (test with strips from a brewing supply store if you want certainty). The high acidity protects against harmful bacteria. People with compromised immune systems, pregnant women, and young children should check with a doctor before drinking kombucha because of the live cultures and trace alcohol.
The recipe uses 1.5 cups of sugar for a 2-gallon batch (about 12g sugar per 8oz of finished kombucha at day 7). After 10 days of fermentation, the bacteria and yeast eat most of it - finished kombucha typically contains 2 to 6g of sugar per 8oz, similar to commercial brands. Longer first fermentation = lower final sugar = more tart taste.
Three options: buy one online ($7 to $15 with starter liquid included), get a layer from a friend who already brews, or grow one yourself from a bottle of raw, unflavored store-bought kombucha (takes 2 to 4 weeks). The online route is fastest and most reliable for first-timers. Look for sellers that ship the SCOBY in active starter liquid rather than dehydrated.
Sealed in the fridge, bottled kombucha holds for 6 to 12 months. Refrigeration slows fermentation to almost nothing but does not stop it - the bottle will keep building carbonation and getting more tart over time. Once opened, drink within 1 to 2 weeks for best taste. Always release the cap slowly the first time - older bottles can be very fizzy.
Yes - buy a bottle of raw, unflavored, unpasteurized store-bought kombucha (GT Living Foods Original is a common starter), pour it into a glass jar of sweet tea (same ratios as Step 3), cover with cloth, and wait 2 to 4 weeks at room temperature. A new SCOBY will grow on top. This is slower than buying one but costs only the price of a single bottle.
The SCOBY (symbiotic culture of bacteria and yeast) is the living culture that turns sweet tea into kombucha. It looks like a rubbery pancake floating in liquid. Buy one online for about seven bucks, or get a layer from someone who already brews.
Every batch of kombucha grows a new SCOBY layer on top, so once you have one, you never need to buy another.
Boil about 8 cups of water (half the total for a 2-gallon batch). Add 24 grams of loose black tea or 12 tea bags and steep for 10 minutes. Black tea handles the long steep time without getting bitter.
Green tea works but is less forgiving for beginners. Stick with black tea for your first few batches.
Pour the brewed tea into a large glass jar. Do not use plastic. Add the remaining 8 cups of cool water to bring the temperature down faster. Stir in 1.5 cups of sugar until it dissolves.
That sounds like a lot of sugar, but the bacteria and yeast eat most of it during fermentation. The finished kombucha has far less sugar than what you put in.
Wait until the liquid cools to 90 degrees or below. Hot liquid kills the SCOBY. Drop it in and let it float on its own. Add about a cup of plain kombucha from a previous batch or a store-bought bottle.
That starter liquid raises the acidity to the level the SCOBY needs. Without it, the culture struggles to get going and you risk growing mold instead.
Tip
Use plain, unflavored kombucha as your starter. Flavored varieties have ingredients that can interfere with the fermentation.
Cover the jar with cloth or cheesecloth and secure it with a rubber band. Do not seal the jar. The brew needs airflow. Use organic cloth if you can. Paper towels shed fibers into the liquid and can ruin a batch.
Put the jar in a dark spot with a steady temperature between 66 and 78 degrees. A closet works. So does inside an oven that is turned off.
Leave it alone. Do not open it, do not check on it, do not move it around. The hardest part of making kombucha is the patience.
Seven days gives you a milder, slightly sweet brew. Ten days pushes it more toward tart and vinegary. Start with seven and adjust from there based on your taste.
After 7 days, the liquid should have lightened from dark black to a golden brown. That color shift is your first sign that fermentation happened. Check the SCOBY surface for any blue or red fuzz - that means mold and the whole batch needs to go.
Strings hanging down and weird textures on the SCOBY are normal. If you have a pH meter, look for a reading between 2.5 and 3.5.
Remove the SCOBY (save it for your next batch) and pour the kombucha into flip-top bottles. This is when you add flavoring - fruit, ginger, juice, herbs, whatever sounds good. Seal the bottles and let them sit at room temperature for 2-3 days.
The sealed bottles build carbonation naturally. Open carefully when the time is up. They can be very fizzy.
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5 questions, answers, and one-line explanations. Tap to expand.
1.What's a SCOBY?
Answer: The Symbiotic Culture Of Bacteria and Yeast - a rubbery pancake that turns sweet tea into kombucha
Living culture that ferments the tea; every batch grows a new SCOBY layer so you only need to buy one.
2.Why use black tea over green tea for your first batches?
Answer: Black tea handles the long steep time without getting bitter
Black tea is more forgiving with the long steep; green works but is less beginner-friendly.
3.When do you add the SCOBY to the sweet tea?
Answer: After the liquid has cooled to 90°F or below - hot liquid kills the SCOBY
Hot liquid kills the SCOBY; wait for it to cool to 90°F or under.
4.Why add starter liquid (cup of plain kombucha) to the new batch?
Answer: Raises the acidity to the level the SCOBY needs - without it, the culture struggles and you risk mold
Starter liquid raises acidity so the right microbes dominate over mold.
5.What signals a CONTAMINATED batch that you need to throw out?
Answer: Blue or red FUZZ on the SCOBY surface (mold)
Blue/red fuzz = mold = toss the whole batch. Strings and weird textures on the SCOBY itself are normal.
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