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
Prahlad Jani is an Indian sadhu who says he has lived without food and water for more than 70 years. His claims were investigated by doctors at Sterling Hospital, Ahmedabad, Gujarat in 2003 and 2010. The study concluded that Prahlad Jani was able to survive under observation for two weeks without either food or water, and had passed no urine or stool, with no need for dialysis. Interviews with the researchers speak of strict observation and relate that round-the-clock observation was ensured by multiple CCTV cameras. Jani was subjected to multiple medical tests, and his only contact with any form of fluid was during bathing and gargling, with the fluid spat out measured by the doctors. The research team could not comment on his claim of having been able to survive in this way for decades.