depends on the reptile you keep
"flushed" snails (feed em with stuff to flush out the bad stuff in their gut), pinkies & mice, earthworms (make sure they aren't the toxic variety), etc
i've actually read that king meals (zophobas morio) has less chitin and would be a slightly better choice, depending on the size of what you're keeping
waxworms are a good treat but very fatty so treat only/for recovering/thin reps
crickets are relatively easy but i found their babies matured pretty slowly and a pain, even had some drown in a droplet of water
used to just put a cotton bud soaked in water for a water source and dried foods (grains, kibble, + some veg for extra moisture). Usually would find eggs in the buds so its an extra egg-laying thingy, just spray once/twice to prevent drying
another thing about crix are they can be cannibalistic, especially when they don't get enough water from their feed
i've seen some people keep silkworms but its quite complicated, especially if you don't have the food source
P.S. meallie eggs & babies are tiny, downright microscopic, i used to keep the substrate in the adult beetle's tank and put some bran, after awhile you can see the ground "moving"