How to Brew Kombucha at Home (and What It Costs)
A bottle of kombucha runs $3.50–$4.00 for 16 oz at the store. Brewed at home, a full gallon — about eight of those bottles — costs roughly what a single store bottle does. Here's how the process works and where that number comes from.
The short answer
Home kombucha is mostly tea, sugar, and a starter culture. A gallon batch uses a few tea bags and about a cup of sugar — on the order of $1–$2 of ingredients total. Split across eight 16 oz servings, that's a handful of cents per bottle versus $3.50–$4.00 at the store.
How brewing works
First fermentation
A SCOBY (symbiotic culture of bacteria and yeast) ferments sweet tea for about 7–14 days. The culture eats the sugar and turns the tea tart and lightly fizzy. This is where the kombucha actually becomes kombucha.
Second fermentation (optional)
Add a little fruit or juice, bottle it, and leave it sealed for a few more days. The trapped carbonation builds the fizz and the fruit adds flavor. Refrigerate when it's where you want it.
The SCOBY reuses itself
The SCOBY grows a new layer with every batch and goes straight into the next one, so your ongoing cost is basically just tea and sugar. One culture keeps a household in kombucha batch after batch.
What actually goes into the cost
Tea and sugar (the recurring cost)
A few tea bags and about a cup of sugar per gallon is the whole recurring bill — roughly $1–$2 a gallon. Everything else you already own or buy once.
Equipment (one-time, optional)
- 1-Gallon Brew Jar — about $18. The simplest way to start.
- Kombucha Starter Kit — about $45, and it includes a live SCOBY.
- Continuous Brew Crock — about $80, for always-on brewing with a spigot.
Even the kit pays for itself within a handful of gallons compared with buying bottles, and a SCOBY you're given by a friend drops the startup cost to almost nothing.
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A quick word on safety
Use clean equipment, keep metal away from the SCOBY, and brew out of direct sun — that's about all it takes to keep a batch healthy.
Try it yourself
Run your own numbers
Your savings depend on how much kombucha you drink, what you'd otherwise pay per bottle, and which equipment you start with. The calculator does the whole tally — weekly, monthly, annual, and how fast your setup pays for itself.
This math, with YOUR numbers — takes 60 seconds, no signup.
Is it worth it?
If you drink kombucha regularly, yes — comfortably. A gallon that costs about one store bottle replaces roughly eight of them, and the SCOBY keeps going for free. If you only grab a bottle now and then, a single brew jar and a starter culture still pay off fast; run the numbers to see your break-even before you decide.
Safety note: kombucha is a raw, live fermented drink that naturally contains trace alcohol. Sanitize your equipment, discard any batch showing mold or smelling wrong, and ask a doctor first if you are pregnant, nursing, or immunocompromised. Full terms & disclaimers →