We all know how our favorite consumer items use so much water to be manufatured. For example,

20: No. of gallons of water to make a pint of beer.
132: No. of gallons of water to make a 2-litre bottle of soda.
500: No. of gallons, inculding water used to grow, dye and process the cotton, to make a pair of Levis' stonewashed jeans.

Also know:
6: Paise a litre(less than one/fith of a cent), the cost producing drinking water from desalkination using the differential temperature of the ocean in Chennai (India), according to the National Instutute of Oceanic Technology