Is there some way to grow yeast using a homemade alternative to the yeast
energizer sold for wine making? I'd like to be able to re-use the yeast from
one batch of fermentation for successive batches. Subsequent batches do not
ferment well, I assume because of a lack of nutrients in juice (I'm making
apple cider from bottled juce). I'd like to be able to avoid having to buy
yeast and energizer from the wine making store. Is there anything I could
get at the supermarket that would work well for "reenergizing" used yeast?
Would pureed bananas, a different type of juice (grape?) or flour and water
or something like that work?


Thanks