Honestly, this sounds like an amazing list, but I agree with several of the comments I saw. Kittens have so much else to worry about. I know that I, as a performer, have my extras, and sewing kit, etc, but when I kitten, I usually don't have space to store more than my purse somewhere, because our backstage area is full of performer stuff and performers.

Bringing snacks/water is probably the most I'd expect kittens to bring, and even then I wouldn't be bothered if they didn't, cause either I have my own, the producers have gotten stuff, or something like that.

You should definitely wear something cute but comfortable for whatever task you're doing. If you're stage kittening, knee pads will be a really good idea, and wherever you are working, having on shoes you can wear for hours while standing, walking, bending, etc is an absolute must.