Hiya Damian,
Happy Early Birthday, and Welcome to planDisney! Celebrating your 21st birthday at Walt Disney World Resort will be the Best. Day. Ever! While
EPCOT's International Food & Wine Festival is the most likely venue for your celebration, I can't suggest enough grabbing a classy cocktail at the
Enchanted Rose Lounge in Disney's Grand Floridian Resort and Spa. It is a perfect place to splurge on your birthday! I'm a sucker for truffle fries and their Mojito.
As you already mentioned, you will need an
acceptable form of valid ID in order to purchase alcoholic beverages. Unfortunately, a temporary paper ID is not an acceptable form of identification. However, each location has discretion on whether they will accept your temporary ID, so you may be able to utilize it (no guarantees however). I suggest bringing the temporary paper ID (as long as it has your photo and birthdate) and an additional form of ID such as your passport. If they are willing to accept your ID, it will help them verify your paper ID's validity.
I hope you have a magical birthday and visit to Walt Disney World Resort! If there is anything else you need, please come back and see us!
Happy Planning,
Ashley F.