Water

As I've previously mentioned in a prior chapter, humans can only survive for around 3 days without water. In addition to that, drinking from random water sources could be severely detrimental to your survival odds. Thus it is imperative that you always boil water before you drink it. In a survival situation, you'll often have to make do with what you have. Even something such as a paper cup can be used to boil water. The heat energy from the fire will mostly be transferred to the water so the paper won't actually burn.

You can even get creative and use something such as a paper bag to cook an egg.

(You'll have to grease the bottom of the inside of the bag)