Eternal Water is not quite as much needed as the other elemental materials, although Blizzard has tried to even out the need for these in Wrath. As always, they can be created using 10 Crystallized Water. (Some might call it “Ice”)
Primal Water Farming Guide for TBC
Primal Water is needed for many things, such as most healing equipment, primal might transmutation, and of course, making gold! Find out where to Farm Primal Water and which spots are the most lucrative!