We started making kombucha a few months ago.  It's a fermented sweet tea beverage - you take sweet tea & add a culture called a scoby (or kombucha "mushroom").  After two weeks, the scoby has turned all the sugar into beneficial nutrients & added beneficial bacteria & yeasts (not the bad ones that take over your body & cause health problems), leaving you with a bubbly, tangy drink.   Normally you get a scoby from a friend, but I didn't have one, so I grew my own from a bottle of storebought kombucha (at $3.99/bottle, it was easy to decide to make my own, esp. considering it's no-brainer easy!).  Now I have kombucha in my home and should never run out or have to buy it again!