Waterworld

The presence of water is sometimes used as a sign that a planet may be habitable, but Gliese 1214B differs from Earth in so many other ways that the general laws of water don't seem to apply. It is comparable to K2-141b in that it has an orbit that completes in under 38 hours and has a mass six times that of Earth. Yet because it revolves around a red dwarf star, where the temperature is considerably more tolerable, there is a layer of water on it.

Yet, it is not water as we know it because of the planet's extremely high atmospheric pressure and temperature, which render the water permanently plasmatic and subject to powerful electrical currents. To understand what we're talking about, picture the entire atmosphere being at the same level as a lightning bolt. The superpressure causes crystallization that has been called "hot ice" down on Gliese 1214b's surface. There would actually be water, and there wouldn't be a drop to drink.