What's Your Thirst For Water? Water. Considering we're constantly drinking it, mostly made of it, and wouldn't be alive without it, we don't give the liquid a lot of thought. That's why, in 1992, the United Nations conceived of World Water Day, which falls on Sunday, March 22. Its mission? To raise awareness of the resource. How much do you know about this precious commodity, which makes up our world of food and drink? Find out when you take Yum's quiz.