Somewhere in your calculation there's an error. 75,000,000 cubic meters of fresh drinkable water fall from the sky per year divided by ( 0.002 cubic meters of

Somewhere in your calculation there's an error. 75,000,000 cubic meters of fresh drinkable water fall from the sky per year divided by ( 0.002 cubic meters of drinking water needed per person per day x 365 days in a year ) = 103,000,000 people quenched per year. Your tiny town gets enough fresh water from the sky for 103 million people -- still impressive.