Hiking equipment
According to Tom Brown, the basic plan for survival is in the order of shelter (including clothing), water, fire, and food. Cody Lundin writes about the "Rule of 3s"; this relates to human survival without basics: three minutes without air, three hours without shelter, three days without water, or three weeks without food.
Therese Neumann
Montague Summers in his book "The Physical Phenomena of Mysticism" speaks of her supposedly supernatural ability to survive for long periods without food or water.