In order to calculate the percentage of drinkable water on earth, we’ll have to start large and "filter" our way through.

One could assume that water shortage shouldn't be much of a concern for humans when considering how much water is in the ocean, especially when 70% of the earth’s surface is covered in it (Bureau of Reclamation, 2017).

That’s 326 million cubic miles of endless blue sea occupying the expanse in between our seven continents.