Given that fresh water might be one of the most precious commodities we have soon as population growth continues. Check out this really cool site that shows you how much water is needed to make common things you use every day.
Can you imagine in your wildest dream that it takes more than 2000 liters (~500 gallons) of water to make one burger? How much water does it take to make a pair of jeans? Go to the site and find out!