I am pretty sure if you had to get your water from one of these devices you would not be using it to flush toilets or other non-essential use.
And actually it does seem like 'drinking water' is actually drinking water and not for all those other uses you mentioned. As 3.7 litres is the amount required for a human male each day.
And actually it does seem like 'drinking water' is actually drinking water and not for all those other uses you mentioned. As 3.7 litres is the amount required for a human male each day.
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h...