With some planning you can improve the situation. Fish and chicken, only enough for supper & leftovers for breakfast. I'ld go with beef for evening through next evening, 36 hrs. Of course smoked and cured meats will last longer. A 2 lb chub of summer sausage will last longer un-refrigerated than it will take you to eat all of it. I would trust eggs to last close to 48 hours (unwashed eggs last longer). I would trust bacon for 2 maybe 3 days. Nido milk powder is in the Mexican section, way better than instant milk. Anything vacuum sealed will last a good while until opened, like the small packs of sandwich meat. Hard cheeses should last 2-3 days, cut the mold off plus a little more if necessary. Touring is a good time to stock up on fruits. Don't forget the veggies for vitamins and bulk.
If it stinks don't eat it. If it smells only a little put more hot sauce on it.
Disclaimer: The above is only my experience and opinions. I have no facts or data to back them up.