70% of the surface, maybe. The rest of this 'ball' is 'filled' with rock and iron. So water is less than 1% of the volume, and that on the outside. Hardly a ball filled with the stuff. Just admit that you spoke inaccurately. It happens; you're human.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'