Unsuccessful fruit fly cultures, any advice?

Question

I'm trying to raise flightless fruit flies to feed my frogs, but I can't get a culture going. I've used various recipes for media on the internet, and I'm putting it in a glass jar, with a Kleenex folded in 4ths held in place over the top with a rubber band. The medium seems to get really dry. What could I be doing wrong? Are you supposed to add water regularly? I think that if the flies are laying eggs it's just too dry for the larvae to grow.

Answer 1

Just feed them banana.