Question

Where is most of earth's liquid water? what must be done so humans can drink it

Answer 1

Nearly all of Earth's liquid water is in the seas and oceans. To make it drinkable, it would need to be desalinated.

Answer 2

The oceans hold the most water! About 96.5 percent of Earth's water. Other water is found as ice, vapour, rivers, lakes, and as soil moisture. desalination is required to make water drinkable.

Hope it helps :)