Question: why do we need to drink water?

Stuart Atkinson answered on 8 Mar 2016:

Life on Earth grew up in a watery environment, so many processes in the body rely on it. For something to live it needs some means of moving things about within itself. In the human body this is done with water eg you need it for circulation (blood contains water and is needed for carrying food, oxygen and waste around the body). You lose water by breathing and excreting, so it needs to get back in there, which you do primarily by drinking.

I wonder if we’d evolved on Titan whether we’d all be drinking liquid methane???