From the bucket flush to reusing pasta water, these novel tricks are a good addition to the tried-and-true tips. California drought or no California drought, we should all treat our water as the precious resource that it is. It’s not infinite and those of it who have it in abundance often waste it heedlessly. The World Health Organization recommends two gallons per person daily to meet the requirements of most people under most conditions – and around 5 gallons per person daily to cover basic hygiene and food hygiene needs. On average, an American resident uses about 100 gallons of H2O per day.