Fruit flies are easy enough to breed. All you need are some jars, instant mashed potato mix, instant baby food cereal mix, sugar or molasses and yeast (baker's or brewer's), and something to put in the jars for the flies to crawl around on off the media. Some people use wide meshed fiberglass screen, excelsior (packing material), shredded coffee filter paper.
Don't breed the winged ones unless you like bugs flying around. Some will escape.
Just google "fruit fly recipes" or the like and you'll find dozens of hits.