Kombucha is a fermented tea with a goofy name that advocates say helps with everything from energy to digestion to hair loss. It's made by taking a batch of brewed tea, adding sugar, and feeding the mixture to a symbiotic culture of bacteria and yeast (S.C.O.B.Y.), which sounds and kinda smells like a science experiment, but is really just a probiotic — live microorganisms thought to be beneficial to the host organism.
It's an acquired taste (read: you might think it tastes like shit at first), and you can pick it up at grocery stores. Or you can go all Dr. Frankenstein and create your own kombucha drink.