Around the world, as much as 69 percent of freshwater use is for agricultural purposes. Further, 80 percent of the freshwater consumed in the United States is for crops and geothermo-electric power. And here are some facts to chew on from U.S. Fish and Wildlife: a family of four requires 6,800 gallons of water to grow a day’s worth of food. It takes 2,600 gallons of water to produce a single serving of steak. It takes six gallons of water to grow a single serving of lettuce. Further, it takes 49 gallons of water to produce one eight-ounce glass of milk, factoring in the water used to feed the cow.