Water

Water comes in various forms in World of Warcraft:

• 1) What you swim in.
• 2) A form of drink used to generate mana while out of combat. Mages can conjure various levels of it.
• 3) An ingredient for various recipes.
• 4) A type of quest item.

• Refreshing Spring Water
• Bubbling Water (req level 15)
• Enchanted Water (req level 25)
• Bottled Winterspring Water (req level 35)
• Bottled Alterac Spring Water (req level 55; BoP)
• Conjured Water (from level 5 spell)
• Conjured Fresh Water (from level 15 spell; req level 5)
• Conjured Purified Water (from level 25 spell; req level 15)
• Conjured Spring Water (from level 35 spell; req level 25)
• Conjured Mineral Water (from level 45 spell; req level 35)
• Conjured Sparkling Water (from level 55 spell; req level 45)
• Conjured Crystal Water (from level 65 spell; req level 55)
• Conjured Glacier Water (from book, level 70 to make; req level 65)

• Elemental Water
• Globe of Water
• Essence of Water

Too many to mention, but here are a few more interesting ones.

• Stratholme Holy Water (also damages undead)

Some shaman skills have water elemental magic involved.

The mage's ice spells technically uses water, but in a solid form. In World of Warcraft, water and ice seem to be separate elements, being just the same element in different physical form.