A roll of TP in disaster circumstances, is like gold in the bank, or cigarettes to those who do but don't have them. Who bothers to think about cleaning yourself with tree leaves, if it happens to be summer. What you gonna do in winter?
Actually, snow balls work quite well, the drier the better, AND the quicker the better or you'll get snow balls! {8^/
Folks, pack along at least 3 ziplocks of 20 latex gloves each in size large, unless one has small hands such as children - if so, have them carry their own zipped glove packs, with 2 zips of 25 nitril (4,5,8 mil usually blue or purple) gloves one zip in your size and the other in large, if not you size.
Never ever cross-contaminate! Meaning scratching, hugging, kissing, leaning on trees and walls if flooded. (I pack VSOP cognac and 15 y.o. scotch for my industrial-strength mouthwash.) We are dirty and buggy animals; one biology professor told me that humans, as disease/parasite vectors to others as well as ourselves, get more dangerous at a geometric rate for every day that we don't throughly bathe under the best possible circumstances. First and second Aid kits, anyone? Lots of handiwipes and shampoo at the bedet, everyone. Humans poop ~1.5-2# daily (~ half by volume is bacteria), if you're lucky. Butt-ugly kills.
Eat with one latex glove, two if preparing a meal. Latex doubled is good for most nursing most sick folks, dry or wet. IF IT IS WET AND NOT YOURS, DON'T TOUCH IT. Nitril is much much stronger and more durable THAN LATEX, even if only 4 mil., and is better used to protect choring hands - especially handling the wounded and dead or game and rats - when for dinner, as rats have all those sharp little bones, better saved as toothpicks.