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.
Blood &amp; Water
Adam's best friend of five years, Joshua, and his lover, Nicole, tell him that they are vampires, and want to turn him into one to save his life. Adam is frightened, but they explain that vampires are not villains who attack innocent humans, and only drink animal blood, because human blood turns vampires into irreversible psychotics that the vampire community must then "take out". Although crosses and daylight are not fatal to them, they are sensitive to light, and wear sunblock and sunglasses regularly. They are immortal (Nicole is 278 years old), never become sick, and have five times the strength of humans, though they can die if they bleed to death or experience massive tissue loss.