Yes. But the thirsty condition is not representative of being thirsty. Its representative of begining to die of thirst. Which happens if you don't get a ration of water.
Again I'd hold that if you're hiking for 20km a day while carrying a ton of gear and drinking only a few mouthfuls of water each day, you will be dying of thirst. You'll be sweating out way more than you're taking in.
No. Its not a perfect simulation of reality. Its a game. But its pretty clear that is what it represents. If you find a source of fresh water not only can you fill your water skin you can just drink your fill from the source and roll no resource dice. Because you are not dealing in rations at that point.
I don't have any issue with that part. My issue was with the notion that once you've moved away from a water source, you can hike for 11 days without needing to find more (all the while also carrying STRx2 other items). Doesn't need to be nerfed into oblivion or absolute realism to satisfy me, but as a backpacker some things defy my suspension of belief too much.
The main counterpoint in my mind is that the PCs are probably coming across water at some frequency without needing to forage at all, and I get that their ration die is somewhat abstracting that. That said if the game is going to model water, I'd prefer it to actually matter (and make the Talent related to it matter) at least sometimes.