Conjured Crystal Water

Conjured Crystal Water is created by mages and helps restore mana to a drained spellcaster.

Source
This item is conjured by mages using the rank 7 spell Conjure Water. A level 60 mage will create 10 charges per cast, and the number of charges increases by 2 each level to a maximum of 20 (at level 65). With the release of Burning Crusade this spell can be learned from a trainer. Previously this spell rank was earned by completing the quest given by Lorekeeper Lydros in the library of Dire Maul.