Jenny,
Thanks for asking your question to planDisney!
Yes, as long as you follow your resort's pool rules as they are posted, you can take your own "adult" beverages from your room to the pool area. As you correctly identified, glass containers, for obvious reasons, are not allowed. It is also important to note that you cannot take any beverage into the pool itself.
BONUS TIPWhile that may be your plan, when I am at a Disney resort pool, I rely on the convenience of the adjacent resort pool bar for a fun cocktail. I have a few favorites, like the Captain's Mai Tai from
Beaches Pool Bar & Grill at
Disney's Grand Floridian Resort & Spa or the Bourbon Breeze from
Petals Pool Bar at
Disney's Pop Century Resort. Regardless of your resort, the pool bars are a great place to grab lunch as well.
Write me back if you have any follow up questions.
Have a Magical Vacation!
Doug