Thanks for the replies. I definitely like cooked food for the supper meal, the other two meals can be cold, except I like warm coffee in the morning. The main changes for hiking on a paleolithic diet is to avoid the stuff that came after agriculture occured - sugar, grain, beans, legumes. With coffee, one does not eat the beans, so that's probably ok and if not, calorie wise, it is zero. So that leaves for hiking: dried meats/flesh or aluminum-foil flesh (tuna, salmon, chicken), nuts, nut-oils, dried fruit and dried vegetables, and "dried" includes freeze-dried. 100% whey powder for protein is acceptable (in some views, including my own). Dried Butter is okay too (for some, --an Amish food seller sells dried butter, believe it or not). Some paleos include cheese although I very much limit it. I've heard of dried cheese but don't know where one gets it.
ps - I use the whey protein for breakfast and sometimes as a mini-snack shake-drink. I cook protein for supper.