Having lived in California for the past year, before moving to Oregon, I've been made pretty aware of the need to treat water as a precious commodity.
I remember reading a sign during the drought at the entrance of a bar in Newport Beach which read: Save water, drink beer. It made me smile, but not for long, as I now know too well how much water crops require.
It virtually only takes 1 gallon of water to produce 1 gallon of water.
So keep that it mind next time you're thirsty. And don't forget to always take your canteen with you when you leave home.