My Grandma was am avid outdoors woman. When it came to preparing for getting lost or stuck out on a trip, she used to always say that if you were prepared for a brew up, you were pretty prepared:

You'd have a chance to STOP
You'd have a safe shelter
You'd have fire
You'd have water
You'd have warmth
You'd have light to see by and signal for rescue
You'd have sustenance
You'd have an animal deterrant

She was a wise woman.