How much water will an average human drink in a lifetime?

Assuming a rate of water consumption of about 1.5 litres of water per day (1 litre is about 4 glasses), and neglecting differences in this amount due to old age and childhood, an average person will consume 43,830 litres of water over an 80-year lifetime.

That's also equal a 3.8m x 3.8m room with 3m (somewhat high) ceilings.

A more interesting question is how much water could a typical person consume in their lifetime. According to the wikipedia.com article on Water Intoxication, an average kidney can excrete about 1 litre of fluid per hour. Let's assume an average person can, at max, excrete 40 litres of fluid per day including urination, sweat, breathing, and others (and including time for some sleep). That amounts to 1.17 million litres over 80 years.

According to the wikipedia.com article for Olympic-Size Swimming Pool, this volume amounts to 46.8% of the typical 2.5 million gallon Olympic pool.

If you filled up bathtubs with 1.17 million litres and laid them end-to-end, the line would go 6.8 kilometers.

Drink responsibly