In a survival scenario, a fire provides many things -- warmth in the cold, heat to cook food and purify water and a potential rescue signal. It also gives you security and light in the dark, both of which help your mental outlook. This goes a long way toward your bid to survive.
In addition to a first aid kit, any backwoods hiker or car camper should pack a small fire starting kit. After you get a waterproof box, pack it with at least two lighters, some weatherproof matches, a flint and a small magnifying glass lens. Here's another good tip -- buy a package of sparklers and cut the stems off. They make excellent emergency fire starters for moist leaves and kindling. Use the magnifying glass lens to concentrate the sun's rays into a fire starting beam of light and heat. Couple the flint with a stone to make a spark. On camping trips, practice starting fires using your kit. It's fun and could even help save your life.