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.
Tanka people
Some Chinese myths claim that animals were the ancestors of the Barbarians, including the Tanka people. Some ancient Chinese sources claimed that water snakes were the ancestors of the Tanka, saying that they could last for three days in the water, without breathing air.