Lots. The Earth is quite big after all. It’s about a billion cubic kilometers. One cubic kilometer is equal to 1000000000000 litres (there should be 12 zeros there if I counted right).
So the total water is 1000000000000000000000 litres (21 zeros).
A big number yes, but believe me, you’d notice if there were only a mere 100000000000000000000 litres of water on Earth.
It’s almost all oceans by the way (ice, lakes, and clouds etc don’t add much).
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