Set up a system for acquiring drinkable water before seeking food. Humans can live without food before they can live without water.
Dig a hole with hands or a stick several feet from a river or lake. Let the hole fill in by itself and use that water to drink.
Lay a tarp or plastic on the ground as if lining a bowl. Leave overnight so the tarp will collect the dew, which is water.
Drink sap from birch trees or maple trees by slicing a branch with a knife or breaking it off. The sap is mostly water and slightly sweet, providing needed carbohydrates.
Follow dry creek beds to the water source. Check a dry creek bed at night and it may contain water not found during the day.
Conserve water by traveling at night and resting in the shade during the day.
Boil water for 15 minutes (and cool) before drinking to make it safe. Use iodine tablets or a water filter if available in your emergency pack.