scientific studies have calculated that the production of one pair of jeans requires around litres of water water footprint network few people realise that when buying a pair of new jeans they are in fact using up as much water as they would normally be drinking over a period of almost years assuming that an average person drinks two litres of water per day similar calculations show for example that the production of one cup of coffee requires litres of water water footprint network few couples that are getting married know that between to tonnes of rock valdivia ugaua had to be mined in order to provide the grams of gold needed to make two plain wedding rings