There has been a lot of attention on the carbon footprint, but the water footprint is perhaps an even more critical concept. A product's water footprint is the amount of water needed to create a beverage, including the water to produce the ingredients. Beer has a footprint of 75 liters of water per glass. Wine takes 120 liters of water per glass. Coffee takes 140 liters per cup. Tap water takes one cup per cup. A liter of soda takes about 132 gallons of water. (Image from Art Action: Turning the Tide on Climate Change.)
Find out more about footprints and how to calculate them from the Global Footprint Network.
An interesting article on this issue: Water Wars - the Beverage Industry as a Canary or Future Innovation Leader?