Kombucha

Kombucha is a fermented tea drink with a taste similar to iced tea, but with a delightfully sour bite to it (kind of like vinegar).  Basically a colony of bacteria in the form of a gelatinous "mushroom" of many layers is placed in a jar and fed a mixture of black tea and sugar, and as the bacteria consumes the sugar the tea gets increasingly tart.  Kombucha mushrooms grow quite fast so some people even eat their mushrooms!  I've heard that dehydrated mushrooms make a delicious chewy snack.  Kombucha has many amazing properties, including anticancer abilities, and can be substituted for vinegar in dressings and other recipes due to its tartness.  However, please note that it is important not to drink too much kombucha from the start as the wealth of probiotics may be overwhelming to some stomachs.  It is best to start with one tablespoon a day and build your way up, preferably not exceeding 1 cup a day.  But don't worry if your system cannot tolerate this wonder drink; just heat it up to destroy the probiotics and you are still left with a nutrient-rich concoction!