With the arrival of Phase 2 and Dire Maul, level 60 Mages can now learn the ability Conjure Water in WoW Classic Fresh. Conjured Crystal Water provides a significant buff to the amount of Mana you regenerate whilst drinking, meaning Mages will most certainly want to learn how to conjure this water for themselves!
Dire Maul Dungeon Guide
The first step is to acquire Arcane Refreshment from Lorekeeper Lydros.