The easiest dry food to make is 2/3rds dried fruit mix, a small amount of Oats, a small amount of instant potato mix, dry spirulina algae powder and a tablespoon or so of dried astaxanthin powder. The rest can be flax seed, dandelions, all kinds of stuff. Then you can have your alternating wet food like fresh fruits and veggies to give them. I've been using that dry food mix for several years with a colony of 5,000-10,000 roaches. Dry food is not hard to make just blend it up till it's the consistency of ground coffee.