lol one time i was in a group and the priest whispers me "hey can u make me some water" so i make him 2 stacks and he whispers me saying "can i have like 5 more stacks" im like dude 2 stacks is enough just dont waste it cause i myself had more mana then him and dont even need 2 stacks of water in 1 instance so unless he wants to follow me around while i grind giving me stam/spirit/and shadow resist buffs im not gonna waste my time making him that much water when hes probably not gonna use 3 stacks of it before he logs so it is just a waste of time
If you knew anything about healers youd know they need to drink constantly and be ready for pulls. They can easily go through 2 stacks in an instance.