Where is most water found on Earth?

In the pacific ocean.

Explanation:

The pacific ocean is the largest ocean on the planet.

If the question is asking for drinkable water then the answer would be in the north pole. (Arctic ocean.)

The ocean holds about 97 percent of the Earth's water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world's total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.