fly food

[LaSiUsNiGeR]

question: what do you feed fruit flies(flightless in a culture thing that you buy online).
i recently bought a fruit fly culture for feeding my lasius niger ants. it comes with fly substrate(?) is that food? it also comes with wood wool(what is the name anyways)is that food? do you feed them:
fruit? special fly food? someting else? nothing?

[LaSiUsNiGeR]

nobody knows???