I think a sliver of soap or a small bottle of Dr. Bronners would be great comfort gear -- maybe not for a PSK, but for anything bigger.

(This attitude presupposes a supply of handy-wipes or a bottle of methanol. I pack both items, and use them for sanitation, i.e. cleaning my hands before preparing food. Otherwise, soap of some kind becomes mandatory for protracted hiking, bugging out, or staying in.)

When camping, I've adopted a diet of foods that can be "cooked" by boiling water and adding it to a zip-lock bag.

http://www.freewebs.com/freezerbagcooking/index.htm

When cooking in a pot, I ladle spoonsful of my coffee or tea into the pot, rub vigorously with thumb or fingers, and drink the result. Mmmmmm, yummy. :-0

Bear