Kombucha with ice made from black teaKombucha tea is a sweetened tisane produced through fermentation. Plain kombucha has an acidic, vinegar-like flavor in addition to the original sweet tea flavor. The strength of the tea flavor can be adjusted with the amount of tea bags brewed per volume of water. Kombucha is available at most health food stores, and the organic section of some regular grocery stores. The steps below outline how to make it at home.