How much clean water is necessary for a comfortable human life?

The amount of drinking water required is variable. It depends on physical activity, age, health, and environmental conditions.It is estimated that the average American drinks about one liter of water a day with 95% drinking less than three liters per day.For those working in a hot climate, up to 16 liters per day may be required.

very much ..............................................

For modern apartment with washing machine/dishwasher  with 2/3 people sharing 170 litres per person per day (inside use only).