At the moment, the only planet known to have any significant "liquid" water, is the Earth. But it's only the surface that is 70% water.
Overall, it's a mere nothing. See the related link for a picture of all the water on Earth.
Earth is 70% covered with water
Earth's surface is covered in about 70% water.
the earths surface is 70% covered by water
Planet earth
About 70% area is covered by water
Google says that earth has 70% water on the planet but there is no planet with water on it completely.
Earth is the planet that is made up of approximately 70% water and 30% land.
Earth has 70% of water on it.
The inner planets do not have a significant amount of water on their surfaces. Earth is the only inner planet with substantial water, covering about 70% of its surface.
Earth
Earth.
The percentage of the plant that is covered with water is 70 percent.