Indonesian 'rainwater communities'
There isn't access to clean water in many places, and there are sometimes long droughts, and drinking rainwater isn't appealing due to cleanliness concerns, although people use it.
Indonesians were (many still are, of course) buying their drinking water. Clean water sales long ago passed into the hands of private companies.The companies own the clean water springs.
Many communities there now use electrolysis, passing a current through the water. It kills microbes and increases the PH value.
Credit for this is attributed to a pastor of one of the communities, Romo Kirjito, who worked for years in his lab trying solutions to get everyone clean water for free (or close to free).