I'm actually going to prove I'm good at Minecraft. I'm going to find The End on Hardcore! You get the idea.
In my opinion, I think that MInecraft itself has gotten a little too RPGish and a little too focused around survival. I know I might be sounding like the guy that goes "i wantz itz on pieceful!", but Minecraft is more about building than being a hardcore survivor. Water would be nice when you feel like you want a challenge, same with hunger. I would rather have a mode where you could turn those off and have food heal you like it used to, without going to peaceful. (sorry if I get a little off topic. I tend to do that).
I've been playing Minecraft since the very first alphas. I live in the wild on all servers apart from smp3. I don't want thirst in Minecraft, hunger was bad enough. I rarely ever use my res but I keep to protect my best builds and to make rupees. I honestly hate most of the people in town "I need rupees" "I want rupees" "S0M3B0DY GIVE ME RUPEEZ NOWNOWNOW!" I'm a hardcore minecrafter. I DON'T want thirst. It makes Minecraft more of a simulator, plus this should on the minecraft forums, not EMC. Or in an email to mojang. If you want a plugin, I don't think there is one and seeing as nobody but you wants it the mods won't implement it for just 1 person.
Yeah, you can drink these, just pretend your dude is thirsty and drink them, the only issue is they don't stack til empty so have fun with that.
This is why I play Minecraft. But I also play it to make cool little stuff, such as this Forge-style mining base.