Happened across these interesting water factoids:

The three basic necessities which sustain life are:

1. air,
2. water and
3. food.

The Rule of Three’s states that a person can live for:

• three-minutes without air.

• three-days without water.

• three-weeks without food.

Without water, or any other fluids, a person will die in about three days.

The above factoids and more are from this Website.