Remember the rule of 3s. You can survive: 3 minutes without air. 3 hours without shelter* 3 days without water. 3 weeks without food.*In general you should find build/shelter before looking for water. 3 hours exposed to the cold can take you out quick. Now if you're stranded on a deserted island and it's 72 degrees in the shade of a palm tree then maybe you look for water first.missed one. I disagree with the shelter question, water is more essential than a shelter. I can't live without water, I can live without shelter; maybe not comfortably, but I can at least survive a day or two without it.