I've been drinking kombucha now and then ever since I first discovered it in college in Santa Cruz, but the bottles in stores are pretty pricey. Most people who brew their own, or even just drink kombucha claim lots of health benefits, from hangover cures to cancer cures, from improved digestion to improved metabolism. I haven't consumed it regularly enough to be able to report on it's actual benefits, but I wouldn't mind doing away with hangovers. About 3 weeks ago, I started my own SCOBY (Symbiotic Colony of Bacteria and Yeast) using these instructions from Food Renegade. Buying one from an online source just didn't appeal to me, but it never occurred to me to grow my own. All I had to buy, in this case, was a little bottle of raw, organic kombucha and pour it into a bowl of sweetened black tea. I put a towel on top of it to keep bugs and dust out, and then put a note on it to keep my mom out.
A week ago, this is what I had:

That white layer on the top is the SCOBY, and it's about 1/4" thick. (I put the tape across the top to keep the towel from dipping down into the liquid.) The instructions I used said the SCOBY would grow in a week, but mine took 2 weeks to get to the right thinkness. I guess it took an extra week because I bought a small bottle of kombucha.
So I boiled one gallon of water and put in two Darjeeling tea bags, then one cup of white sugar. I would have preferred to use pu-erh tea, but I had neither on hand. Next time.
I'd previously bought a 1 gallon glass jar to hold the full batch of tea, so once it cooled down a bit I poured it in there. I waited for the tea to come to room temperature and then transferred the SCOBY into the jar. It didn't feel nearly as icky as I expected! It was a little slimy on the bottom, but very firm, so I had no difficulty moving it. It sunk right to the bottom of the jar, where it is now. In about a week, I should have a slightly sour, fizzy, apparently miraculous drink ready to bottle. I'll let you know how long it takes for immortality to set it.