Basic traditional recipe for homemade kombucha using black tea and cane sugar as used for centuries in Russia.
Boil 3 quarts of water.
Add 1 - 1 1/2 cups white sugar to the boiling water and dissolve.
Continue to boil sugar water for 5 minutes.
Remove pot from heat and add 3 black tea bags and 2 green tea bags. Brew for 10 minutes.
Remove tea bags and let tea/sugar mixture cool to room temperature. Do not cool too long!
When mixture is just room temperature, add 6 oz of kombucha starter and 1 kombucha culture.
Cover with a white, prelaundered flour sack cloth (available at Walmart for $5 for a pack of 5) and attach with a large rubber band.
Leave in a quiet semi-lit room (no direct sunlight) for 7-10 days. When a new "baby" culture forms on the top of the brew and it is at least 1/8 " thick, you may harvest the brew.
Store in clear glass only in the refrigerator.
Repeat the process to brew as much as your family desires.
It is important to only use cane sugar for this recipe. If you use plain white sugar from the supermarket, be sure it says 100% cane sugar. In North America, plain white sugar not labeled as cane sugar is all or partially beet sugar made from GMO beets.
In a pinch, you can use 4 ounces raw and unfiltered apple cider vinegar in place of the 6 ounces of kombucha starter.