Zapped, thanks so much for the extra info!
Honestly, I wasn't very precise with my additions. I should
have been, but I was in a rush. I basically just added stuff to the bottles (12 oz) before pouring the kombucha on top.
The juice I think I added something like 3 table spoons, if I had to guess. I put something like 8 blueberries in one (i squeeze them between my fingers before dropping them in. Maybe 4 cherries that I chopped up went in the other. And probably about 1 tablespoon of ginger and 1 teaspoon of lime juice in the last.
These are all estimations. In the future I'll be much more precise.
Chaucer, I'm also thinking about buying a scoby, but for now, my homegrown is working. the Kombucha Kamp rep posted in another forum about how the ones we're growing is from the "reformulated" kombucha, and thus has a different taste, and reduced probiotics (though there doesn't seem to be definitive info on which ones/how much, etc).
After some more reading, I noticed that GT Dave mentioned that the reformulated version is easier for newbies to enjoy (I think he refers to it as the "light" version), and that the "classic" has more bite. That bit of info actually has made me rethink buying a SCOBY, because I rather like the flavor of the one I'm making, and I'm not sure if I'd enjoy more "bite" or not.
If you do buy one, I'd appreciate a side by side review of a homegrown SCOBY versus the purchased one, and how the resulting Kombucha differs. I wanted to do something like that eventually, but have no immediate plans to.