It takes 3 clicks to pick up waterflask, fill it with water and put it back, but it would be nice if we were could just right click the barrel(which would result in changing cursor icon so u will know if u right click it by mistake) and then u would be able to just left click 1 time flask one time to fill it. This way it would reduce amount of clicking to fill many waterflasks a lot.
I doubt anyone likes filling all 30 waterflasks with water after they drinked it all.



Second idea
We are able to split things like flour, ash, coins and other. We should be able to split water this way too. (if we have another flask that isn't full in inventory)