I figured I'd update this thread, since I've really settled into a rhythm with Kim that is working well. I have settled on 1/4 cup of grains per quart being the best amount, feeding them 1/4 cup of turbinado sugar, plus a pinch of baking soda every other feeding. Occasionally, whenever they are looking a little sad, I'll fed them 1/2 molasses/1/2 sugar to give them a little boost. I was feeding them every 3 days, but now that it's colder I'm feeding them every 4 days, since their metabolism is a little slower. I have 4 quarts going, and I have been making all sorts of great fall flavors like apple and apple cinnamon lately. Pear is also really delicious. We also found that using the real soda bottles is kind of a hassle, so we just do the second ferment in another ball jar, and it pressurizes enough for our tastes.