Survival skills
A human being can survive an average of three to five days without the intake of water. The issues presented by the need for water dictate that unnecessary water loss by perspiration be avoided in survival situations. The need for water increases with exercise.
Longevity myths
The idea that certain diets can lead to extraordinary longevity (ages beyond 130) is not new. In 1909, Élie Metchnikoff believed that drinking goat's milk could confer extraordinary longevity. The Hunza diet, supposedly practiced in an area of northern Pakistan, has been claimed to give people the ability to live to 140 or more. There has been no proof that any diet has led humans to live longer than the genetically-recognized maximum however Caloric restriction diets have increased lifespans of rodents significantly.