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.
Inedia
Ram Bahadur Bomjon is a young Nepalese Buddhist monk who lives as an ascetic in a remote area of Nepal. Bomjon appears to go for periods of time without ingesting either food or water. One such period was chronicled in a 2006 Discovery Channel documentary titled "The Boy With Divine Powers", which reported that Bomjon neither moved, ate, nor drank anything during 96 hours of filming.