oh yea had a dude up in the mountains on mushrooms for the first time...we were backpacking so not car camping and we each brought about a 1.5 liter water bottle with us.  We were coming down from the trip but this guy was freaking out and saying how thirsty he was over and over and we're like "dude go find your water bottle" and he said it was already gone.  He had consumed about 2 liters worth of water in 15 minutes. At that point we had to physically stop him from drinking more water so he wouldn't hurt himself.  (luckily a couple of us were very experienced with mushrooms and were coming down at that point).   Very odd situation and def when tripping with people that are not experienced it's good to have someone or multiple people not high so they can trip nanny.