Chewing gum stimulates the production of saliva which temporarily eases your thirst. This can buy you time to find drinkable water, and to help you to wait for

Chewing gum stimulates the production of saliva which temporarily eases your thirst. This can buy you time to find drinkable water, and to help you to wait for water to be treated - you DO NOT want to risk diarrhea in a survival situation.