@Azarthes If you were committed you'd shower with the suit still on.
<Snipped quote by Halo>
I scoff internally whenever someone mentions being cold. I'm already an old man when it comes to that subject, that whole uphill-both-ways type gripe has thoroughly penetrated my mind. "Cold? Pssh, you don't know what cold is!"
<Snipped quote by Antarctic Termite>
Honestly, there's no good reason to worry about it. The amount of water that you use to take a longer than necessary shower is drastically smaller than the amount of water that was used to, say, cultivate the almonds that you snacked on afterwards. Most of humanity's water use is agricultural or industrial. Personal use, even to a frivolous degree, is negligible.
Plus, you're not really consuming water when you take a shower, at least not in the same way that you consume petroleum when you ignite your engine. It's all filtered back through and reused. Earth has exactly the same amount of water on it right now as it did before Homo Sapiens first carved a sharp rock into a sharper rock.
Uh wrong
We must have water in ISS