One widely circulated concept to help set priorities is called the "Rule of Three": 1. Humans cannot survive more than three hours exposed to extremely low temperatures. 2. Humans cannot survive more than three days without water. 3. Humans cannot survive more than three weeks without food. These three rules can be a foundation for any emergency. Pack accordingly.
Actually as I understand it, it isn't "three rules", it is "Rule of Threes" Add to the above. - Three seconds of stupidity will get you killed. - Three minutes with out oxyegen and your dead. But hey, it's not my post, so I don't get to make the rules. :dunno:
