how about this, mix up some yeast (baker's or whatever) and water, add equal amounts to a few bottles. put your normal amount of carbing sugar in a couple, and different amounts of cherries in others, do a few replicates for each treatment, cap each with a balloon, put them in a warm place and watch. compare inflation. you could use a shedload of yeast and have them very warm, you just want to ferment everything out asap. i don't know... maybe i'm typing faster than thinking
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