| Producing a typical lunch - hamburger, french fries, and a soft drink - uses 1500 gallons of water. This includes the water needed to raise the potatoes, the grain for the bun and the grain needed to feed the cattle, and the production of the soda.
Nearly 97% of the world's water is salty or otherwise undrinkable. Another 2% is locked in ice caps and glaciers. That leaves just 1% for all of humanities needs - all its agricultural, residential, manufacturing, community, and personal needs.
There is the same amount of water on Earth as there was when the Earth was formed. The water from your faucet could contain molecules that were in a prehistoric sea, millions of years ago.
A person can live about a month without food, but only about a week without water.
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