Below, the water requirements for some of the things you might be wearing/eating/using right now:
One pair of shoes: 2,257 gallons
One pair of jeans: 2,636 gallons
One chocolate bar: 454 gallons
One piece of beef: 4,000 gallons
One hamburger: 632 gallons
One plain-cheese pizza: 321 gallons
One slice of cheese: 40 gallons
One pint of beer: 45 gallons
One cup of coffee: 35 gallons
One apple: 22 gallons
One loaf of bread: 13 gallons
One sheet of paper: 3 gallons
Source: The Atlantic