Each rank starts out at 2 per cast and you get another 2 per cast for each level up to 20. By the time you get over 10 you’re only a few levels away from another rank of it because they get the new rank every 10 levels and the water is already outclassed by vendor water once they’re 5 levels in.
When it takes around 4-20 casts just to make 2 stacks and each cast takes a chunk of mana and the group is already clearing, yeah, it’s a bit a selfish thing to do to get pissed at someone because you’re a lazy PoS who didn’t bring your own water and get mad that they didn’t give you more than 40 and want them to OOM in the middle of clearing so you can have even more.
Here’s a novel idea. If and when you run out of that 40 water… just say you need more? Like lmao dude get real.