Desalination
The best way to make water drinkable
FUN FACTS
San Diego recently invested a billion dollars into a desalination plant to convert Pacific Ocean saltwater into as much as 56 million gollons of drinking water per day
As of 2013 Dubai was sourcing over 98% of its potable water supply from desalination
The process/cons
https://www.youtube.com/watch?v=aysj7696b0A
With a world that is made up of 70% water this shouldn't be much of an issue but unfortunately most of the water that we have is salt water not fresh water
For the average desalination plant right now, it takes 2 kilowatt hours of energy to produce 1 cubic meter of fresh water. Although that translates to a cost of under $2
https://www.youtube.com/watch?v=clWHOMJAZL8
The sea as a source of drinking water seems to be unlimited, but pollution by land-based activity often impairs the quality of coastal water bodies that serve as feedwater for desalination plants