I feel like I'm drinking more in the burnt biome and even more in the desert. Don't have any data to back up my gut feeling. There have been times when I shouldn't have trusted my gut but I had a good time anyway.
The rate at which thirst and hydration declines is different in each biome now, especially without protection. I don’t have the stats, but do a search online or check YouTube. Might even be in the 2.5 release notes.