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.
Elixir of life
In the eight-century "Man'yōshū", 'waters of rejuvenation' (, ) are said to be in the possession of the moon god Tsukuyomi. Similarities have been noted with a folktale from the Ryukyu Islands, in which the moon god decides to give man the water of life (), and serpents the water of death (sïnimizï). However, the person entrusted with carrying the pails down to Earth gets tired and takes a break, and a serpent bathes in the water of life, rendering it unusable. This is said to be why serpents can rejuvenate themselves each year by shedding their skin while men are doomed to die.