I keep a small dish of oatmeal in with my crickets for a staple diet. I supplement that with veggie scraps that I have leftover from dinner or from feeding my Hermann's tortioses. For moisture I use water crystals, they soak up water and expand to about 100 times. The crickets can then get water from the crystals without drowning. I keep my crickets in a 55gal storage container with top soil substrate and egg cartons and paper towel tubes for them to hide in. I raise my own because I live in Montana and getting crickets shipped in the winter can be iffy.