Is drinking water an important feature for finding habitable exoplanets? Has it been found? We need drinking water to live on other planets. Has drinking water been found on other exoplanets? Is drinking water an important feature for finding habitable exoplanets?
I want to (self) study in this field and I need some information.
 A: Drinkable Water is H2O that contains the number of dissolved salts and living organisms that a human being needs in order to replenish the water and minerals lost through transpiration, breathing, and other "waste" cleaning processes (e.g. urine production).
For example, on Earth, the ocean water is not "drinkable", actually we have a big issue finding drinkable water resources as many get contaminated or exhausted.
As such, we have not yet discovered drinkable water on other planets.
That said, we may find water resources -in any of the three main phases of matter (solid, fluid, or gas)- that we could adapt to be drinkable, the same we do on Earth when we desalinize ocean water or use condensation to retrieve water from the atmosphere.
Thus our search is for water in any phase, not specific "drinkable" water
And yes, we have already discovered water in many celestial bodies, mostly in the solid form (ice), but it is speculated that other celestial bodies, for example, the moon Europa, may be a Waterworld with a big deep ocean below the ice.
Discovering water on distant stars is done via spectrographic analysis when the planet transits above the remote star.
Some exoplanets have shown signs of water vapor in their atmospheres.
A: Drinkable water has not been founded on other planets yet. However, we can probably find liquid water from some planets.
In addition , water of solid phase has been found on Mars, which indicates it is possible that creature lived on Mars in history.
