When we lived ashore in Bocas del Toro, Panama
(mid 90's), fresh water delivery
pipes from the lake were famously unreliable, due to upheavals during the earthquakes a few years earlier. Since the air was very clean, rain barrels collected roof water for most houses via pipe and insect screening.
Delicious, untreated and always ready.
And not something I'd try in some parts
of the US.