When there is a great loss of blood there is also great thirst, for the water in the body is also used to provide fluid so that the blood volume can be maintained.

Man can likewise live for some time without water, but not nearly as long. One reason for this is that the body is continually giving off water in perspiration and respiration (breathing), and through the kidneys, even though no water is imbibed. And even though the body is two thirds or more water, a 10-percent loss of body water is very serious and a 20- to 22-percent loss results in death. God therefore wisely arranged that, since earth was to be man’s home, there should be an abundance of water so that few persons are ever forced to go without water for any length of time.

The way our bodies have been constructed gives them the greatest margin of safety when it comes to going without food and water.