On one hand thirst mechanic does seems to be appropriate for a survival game. But on the other hand what exactly does it add to the experience? Just another stat to babysit
Thinking about managing thirst already gives me a headache. Because finding water is only one part of the equation. You also have to purify it, store it in a portable vessel, keep an eye on another bar, etc. Let's say the easiest way to make water drinkable is to boil it. Okay, you've boiled a pot of water and now you'll have to sit and wait for it to cool down, because shoving 100 C water down your throat sounds like a bad idea.
So overall I feel like it will most likely leave negative impressions on the players.