Ya can die in a few days without water. Ya can die in a couple of weeks without food. Ya can die in a few hours without shelter under the right conditions. Hypothermia kills more folks in survival situations than dehydration or starvation. First thing to do is find or build shelter and if you expect to be there for awhile, make it better somehow every day.
...that's just my humble opinion.

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!