Fire provides an assortment of advantages in survival situations, however none is as crucial as helping you to boil water. Water is one of the most important resources for survival, as people can only go several days before perishing from dehydration.
While most water sources have a variety of dangerous bacteria as well as pathogens, you can eliminate them by boiling the water for a few moments.
Apart from enabling you to boil water, fire allows you to cook any food you may get. While a few animals, like earthworms as well as fresh fish, may be edible raw, you need to cook any kind of mammal, bird, reptile or amphibian you catch to be able to kill any internal parasites and bacteria. Fire also gives warmth, which can be lifesaving in case you are in a cold environment. Also, fires supply light at night, which helps keep you more secure and allows you undertake chores in the dark.