Got sweaty? No river in sight since hours? Drank almost all of your liquid supplies? About to fully empty the last bottle of oh so precious water on your head?
Behold! Remember the 1, 2, 3, 4 of the Wash Without Wasting Water method! Carefully use a few drops here, there, there, and there (in that order and twice each (clean + rinse))! Survive because you stay free of both diseases and dehydration!
Then rest, and enjoy another day full of beautiful surprises.