According to a study done by the journal PNAS, the average American underestimated how much water they use by about 50%. Is it a shock to you then to find out that we use about 80-100 gallons of water daily? That much water can fill up the average bathtub nearly 4 times! Wether this be to flush toilets, wash dishes, hands or showers, or even growing food, we obviously need to be more considerate about how much water we use.