This is a bit disgusting, but I must share. Don't worry, it's on topic. Honest.
Over a month ago I made a fruit fly trap for my kitchen. I poured some apple cider vinegar in a glass jelly jar, along with a piece of rotting fruit, then covered the jar with plastic wrap secured with a rubber band...poked holes in the plastic, so the fruit flies can get in but can't get out. (The kids call it the Fruit Fly Hotel California and talk about how the fruit flies like the pool so much, they dive in and never leave. But I digress...sorry.)
Well, along with the ACV and piece of rotting fruit, I had also dumped the remnants of a store-bought bottle of GT Synergy Kombucha in there. Not much kombucha at all, maybe just the bottom inch or so left in the bottle.
The Fruit Fly Hotel California got pushed to a back corner of the kitchen counter and I hadn't looked at it for awhile. Today, I happened to look. Guess what else is floating in there, along with ACV and the now-really-rotten piece of fruit and the hordes of dead fruit flies? A SCOBY! I couldn't believe it. A double-layered scoby grew in there and is floating right across the top of the, um, pool.
Of course I will not use it to make Kombucha, since everything else in there looks absolutely disgusting...
...but I share this just to confirm that, yes, apparently you really can grow a scoby from a bottle of store-bought Kombucha! Even in less than stellar conditions.
Sorry for the grossness...