Turns out, my mom has prior experience with culturing fruit flies....... And she did it with ketchup.... So, i added some ketchup with some corn starch (for consistency) to a water bottle and threw some coffee filters in. I'm gonna add some flies tomorrow. It makes sense that it would work (mashed fruit and vinegar, the basis of a lot of culture mediums i've read about), and apparently it works. Only issue is, i can't find a online source of info for this, other than a thread on a dart frog forum with some photos of a bunch of wild fruit flies in a ketchup jar...

Anyways, Anyone else ever try this? did it work out well? I'm doing it as a bit of an experiment, and if it works well, i have found a cheap and easy way to culture flies for my darts