I really love the Italian Margherita at the Tutto Italia kiosk. It's grappa, limoncello and lime juice (but it also comes with a hefty price tag $10 last I checked).
Margaritas on the rocks at La Cava del Tequila in Mexico. Real drinks that actually have a good amount of alcohol in them. A side of quacamole goes very good with them.
We always like getting a wine flight from the cute wine shop in the back of Germany's gift shop. DH & I will share a wine flight & pick our fave. Then, we get a full glass of the fave. We also like to order the huge liter sized beer w/ dinner at Biergarten.
It is not in the WS at Epcot but you could take a stroll through the International Gateway to the Beach Club and get a Mango Mojito at Hurricane Hannahs. It was the best the drink had on our last trip and it was great to sit on the beach and enjoy it!
After the Grey Goose Slushy and the Grand Marnier Slushy I would suggest a French Kiss (champagne and pom liquor) I usually plan to drink around the world, but never make it past France...
LoL and after the French Kiss you should try a ... lol just kidding lets hope you'll still be able to walk to the next country!!! lol you'll be ready to let loose & party after a few drinks & slushies!