Our bodies are 79% water and it's required to live. We use it in most meals because it has a stable boiling point of 100 degrees which draws a clear line. And of course how else can the Britts say a bottol of wah uh.
To find a water source drinkable people usually drill up water pockets that are all in the earths crust. Water springs also exist. If you are in the forest, using a sock and sand can get you up to speed but I'm no survival expert.