Drink the following Cataclysm beverages.

Darkbrew: Lager cooking
Fungus Squeezings:  sold by Grunka in Hyjal
Highland Spirits: cooking
Murky Water: Sold by Grunka in Hyjal. Also sold by Zungam in Zul'Aman in a hut on the way to Halazzi.
Sparkling Oasis Water: sold by innkeepers
Fresh Water: sold by inn keepers
Greasy Whale Milk: Sold by Caretaker Movra in the Shimmering Expanse at Silvertide Hollow.
Highland Spring Water: sold by innkeepers
South Island Iced Tea: cooking
Starfire Espresso: cooking

Remember this is a cata achievement so these drink can be drops in those area and inns

Before you go and find most of these at the auction house go ahead and check you cooking tab, You may be able to create these yourself and save some gold!

alternatively you can check out the sweet guide over at wowhead