Water spells were in the old version but were taken out entirely around patch 1.19 in preparation for the job system back in the day, it was funny because all the water enhancing gear was left in the game but it didn't do anything anymore, then Water was somewhat reinstated and renamed Fluid Aura in 2.0. It's just another silly design decision just like elemental damage not mattering anymore, though I also still hope they eventually reintroduce the actual spell line one day.