If you buy the phoenix worms they will come in little cups and you don't really have to do anything for them - like butterworms. However, they will die off and when they do it's a strong ammonia smell, which is pretty unpleasant. You could probably throw in some dry bug burger to help gutload them, however I just raise my own.
I bought a contraption (the name escapes me right now), but it's a gray bucket-type thing that has a collection cup on the side. Inside the bucket are 2 slopes that end up at a hole which drops into the collection cup. Just throw vegetable scraps in it, let the local mayflies fly in and poof, you'll have phoenix worms (that's actually a copywritten name, dependent on exactly what species of fly is being bred, however it works for these purposes). Don't ever put meat scraps in there, because vultures will tip over the bucket and make a royal mess (yep, learned that one the hard way).
Keep the bucket outside - you will probably have to quit production in the winter when the flies go into hibernation, however here in FL I can produce all year round. The nice thing is that I know by what I put in there as food as to how they are gutloaded! Good luck!
PS Phoenix worms will get pretty expensive pretty quickly, so you may want to consider raising your own during the spring and summer, possibly fall, and then switching to crickets (or dubias) over the winter.
