this question may seem difficult to answer, but as a mathematician I'm going to try to give an approximation. Since over 99% of the planet's water is salty, we will calculate only the water in the seas and oceans. Searching
google "average depth ocean" we know more or less the oceans have an average depth of 3,900 kilometers.
Earth has a mean radius of 6371 km (this also can be found on google by putting "average radius of earth).
Let's imagine that the planet are two areas of land, with a radius of 6371 km and another where there are 6371 water +3.9 = 6374.9 km.
Let's calculate the volume of water for different volumes.
4 / 3 x pi x (6374.9) ³ - 4 / 3 x pi x (6371) ³ = 1,990,470,000 cubic miles.
Keep in mind that the sea does not cover the entire surface of the Earth (as we assumed), but covers the 5 / 7 parties. So we 1,990,470,000 * 5 / 7 = 1,421,764,200 cubic kilometers of water.
a cubic kilometer is 1,000,000,000 cubic meters, is one trillion liters. Therefore
on earth is about 1,422 trillion liters.
As my friend would say Alfonso, water for all.
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