Thank you for your reply.Just to be clear: prestidigitation has the option You chill, warm, or flavor up to 1 cubic foot of nonliving material for 1 hour. I'm quoting it because I didn't realize it lasted a full hour.
There is no logical reason it would not work. In theory you might have to sleep without your armor, but jungles can actually be downright chilly at night (50s at night are not uncommon at night in many jungles). I've backpacked/camped in the Amazon and we had to have sleeping bags.
Of course this does nothing to punish people wearing heavy armor, it makes it far too easy to circumvent so it probably isn't acceptable. I could always create a new, harder, challenge later on...
I'm sure it's acceptable to some, just not to me.
If I were to run the game for a bunch of newbies, and perhaps start the adventure at level 1, I would most definitely reward such inventive thinking, mentally scratching off heat as one of the jungle challenges.
But with veteran gamers 'porting into Chult at level 5, I can already from the beginning see that spending all those words on water-collecting and exhaustion saves are a total waste, and something much more difficult is necessary for the players to actually engage with the environment.
This is after all our collective goal, I imagine. To bring Chult to life, the jungle needs to meaningfully affect the mechanics of the game.
To newbies, drinking 2 gallons of water is just that. To you and me, probably not.