"The University of Twente, in the Netherlands, has created a novel online calculator for water www.waterfootprint.org - able to calculate the impact of individuals and countries on global water reserves. The site brings to attention all the water we consume without realizing it. For instance, you can discover that a single cup of coffee requires 140 liters of water: the water required for the cultivation and processing of the coffee beans. A kilo of beef needs 16,000 liters of water: not just the water drunk by cattle but in particular the water for growing, harvesting and processing cereals and feeds.
And so on: an apple - 70 liters; a glass of beer - 75 liters; a slice of bread - 40 liters; one kilo of cheese - 5000 liters; a kilo of chicken - 3900 liters."
From Slow Food's Terra Madre Newsletter