Hiking equipment
According to Tom Brown, the basic plan for survival is in the order of shelter (including clothing), water, fire, and food. Cody Lundin writes about the "Rule of 3s"; this relates to human survival without basics: three minutes without air, three hours without shelter, three days without water, or three weeks without food.
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.