Probiotic tea, also popularly known as kombucha tea, is used widely for its many claimed health benefits. You can easily find probiotic tea in a health food store; but if you tend to drink a lot or just enjoy experimenting in the kitchen, it is much more fun to make your own.
Bring 4 quarts purified water to a boil in the large sterile stainless steel cooking pot. Decrease the heat to a simmer, and add four or five black tea bags. Let them steep for 20 minutes, then remove the tea bags. Turn off the heat. Add 2 cups sugar. Let this sit until completely cooled.
Pour the cooled tea into a large glass jar. Add 2/3 cup probiotic tea starter, and carefully place the probiotic tea culture on top.
Cover the jar with a clean cloth (muslin, a cotton napkin or a clean dish towel). Secure the cloth to the jar with a large rubber band.
Let your probiotic tea sit in a warm, dark place for 10 to 12 days. The longer the tea sits, the stronger it will become. Test the tea by scooping out a small amount with a sterile ladle.
When your tea is done, remove the probiotic tea culture and 2/3 cup tea to start your next batch. Keep the tea in the glass jar or transfer it to bottles. Store in the refrigerator.