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.
Madre de aguas
It is said that it inhabits rivers and lakes, which never dry out while it lives there. Madre de aguas lives for hundreds of years, and anyone who tries to kill or capture it dies. It also is said to be a fearsome animal that when hungry could completely engulf a calf.