I've also used this recipe to culture waxworms, it's a bit simpler and works well too: Breeding Waxworms

One thing you want to keep in mind is that waxworms can eat through plastic when they run out of food/medium, so if you're going to culture them in jars you should use glass jars with metal screen lids. Also make sure the screen is very fine or the tiny larvae will escape (it's happened to me a few times when the mesh wasn't fine enough).

One methods for feeding out the moths is to put the culture in the fridge for a bit until they slow down, then once they're in your vivarium they'll warm up again and become active. I've stopped culturing waxworms since I never found a good method to harvest the larvae from the medium (any suggestions?).