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Given how simple Water is and how readily available it's components are, it's inevitable there are many planets with vast oceans.

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At least 30% of the bodies in _our_ solar system have vast oceans.

You are right, it's inevitable.

Water oceans? It’s far far from 30% isn’t it? Is there an image of a single water ocean not on Earth?

There is an ocean somewhere near Jupyter or Saturn.

Due to some counterintuitive geothermal reasons, it's likely that three of the four Galilean moons (of Jupiter) as well as Titan (Saturn's largest moon) all sport significant underground oceans of liquid water.

For example, despite being much smaller than the Earth, Ganymede is projected to harbor more liquid water than all of Earth's oceans combined.

(Whether this adds up to 30% depends heavily on what you start counting as a "body")

I did not do the math at all correct. (I'm on vacation and apparently left most of my brain cells at home.)

I stupidly counted:

9 planets total

2 "ocean" moons (Enceladus + Europa) + Earth = 3 bodies with water. 9 divided by 3 = 30%

So that is my half thinking.

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