Here's the link to National Geographic's "The Hidden Water We Use" page. I thought this was really interesting when I was trying to gain perspective on how much water individuals around the world consume. The production of everyday goods like coffee prelude to a shocking 880 gallons of water used for every 1 gallon of final product.
Again, a great deal of this has to do with the irrigation of crops that are necessary for the product. For instance, 1 pound of beef requires nearly 1800 gallons of water. The majority of this water is not used for hydration of the cows, but for the growth of feed crops such as corn and grass.
I found this whole webpage to be pretty informative. It does a good job of putting into perspective the materials used in processing of all of the products that we take for granted.
The Hidden Water We Use