I've been feeding earthworms sourced from my backyard, as well as cave crickets that I catch from my grandma's storage room. Her storage room is absolutely infested and since the crickets don't get in the house she doesn't bother bug bombing, so it works out perfectly. You can make a bug trap out of a 2 liter bottle; cut the top "cone" off, rinse both out really well, put a potato or fruit slice in the main body of the bottle, then invert the "cone" into the main body of the bottle to create a funnel shape into the chamber. Put it in the right area and you'll have more bugs than you know what to do with trapped in the bottle!