Use it near water to fill it. Cook it over a camp fire to get drinkable water.
You can cook a stew with the cooking pot. After adding the pot filled with water on a fire, add a choice of 20 ingredients (8 meats, 6 mushrooms, 4 herbs and 1 berry and oysters), it will start a 30s cooking period after which stew will be ready to eat, providing hydration, fullness and other benefits based on recipe. Can remain on the fire up to 10 minutes. Note, you can also add ingredients to pot without water, however this will not provide hydration and will burn food extremely fast.