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.
Inedia
Hira Ratan Manek (born 12 September 1937) claims that since 18 June 1995 he has lived on water and occasionally tea, coffee, and buttermilk. Manek states that Sungazing is the key to his health citing yogis, ancient Egyptians, Aztecs, Mayans and Native Americans as practitioners of the art. While he and his proponents state that medical experts have confirmed his ability to draw sustenance by gazing at the sun, he was caught on camera eating a big meal in a San Francisco restaurant in the 2011 documentary "Eat the Sun".