I’ve got a list going of various fictional beverages. Most of these are drinks I’ll definitely try out sooner or later; I’m trying to focus mostly on books (sorry, no Romulan Ale!), and would love your suggestions, if I’ve left out any awesome drinks!
The List:
Blue Milk, from Star Wars
Islington’s Wine & Serpentine’s Restorative, from Gaiman’s Neverwhere
Wonka’s Buttercup Tea
Dickens’ Christmas Punch
Other Mother’s Hot Chocolate, from Coraline
Anne of Green Gables: Currant Wine, Raspberry Cordial
Chocolatl, from the Golden Compass
Fleegix, from Alan Mendolsohn, Boy from Mars
Harry Potter: Pumpkin Juice, Nettle Wine, Firewhiskey, Gillywater
Ent-draught, from LotR
Alice’s Potions for Growing and Shrinking
Pan Galactic Gargleblaster
Austershalin Brandy, from Gentlemen Bastards series
Klah, from the Dragonrider series
Ambrosia, from Battlestar Galactica
Grog, from Monkey Island
Blackbriar Mead from Skyrim
Food Through the Pages 
Don’t forget the Pan-Galactic Gargle Blaster! (Hitchhiker’s Guide to the Galaxy)
Klah, from Anne McCaffrey’s Dragonriders of Pern series.
More Harry Potter beverages: Gillywater, Butterbeer, Firewhiskey and Nettle Wine
You can find a list with even more Harry Potter drinks there: http://harrypotter.wikia.com/wiki/Category:Drinks
Good call on the Raspberry Cordial. What about Joie – from the Kushiel series: “Joie, a type of clear cordial similar to ice wine, is drunk on the Longest Night. D’Angelines consume small glasses of it and say to each other, ‘Joy to you on the Longest Night.'” and also described as, “a clear, heady liquor distilled from a white mountain flower. It tastes like champagne but is roughly as powerful as vodka.”
Absolutely! I got another vote for that on Twitter this morning, and it sounds wonderful! 😀
Cardamom Tea, from Saladin Ahmed’s Throne of the Crescent Moon!
Oh, that sounds amazing! I LOVE cardamom!
Moloko Plus from A Clockwork Orange
I was re-reading Dune last night – what about Spice Beer?
Or for that matter, WATER OF LIFE