Hi there, Deborah! Welcome to planDisney!
As someone who loves to taste her way around the World Showcase (and beyond), I've encountered many a drink cup at EPCOT, and I'm more than happy to answer your question to help you stay hydrated in the Florida sun.
You'll find that the drink cups in
EPCOT come in a wide range of shapes and sizes. At
Connections Cafe, you'll find your typical tall, grande, and venti Starbucks sizes. At the Quick Service dining locations, you can choose from small (approximately 4-5 inches tall) or large (approximately 6-7 inches tall) paper Disney World cups. Around the World Showcase, you can find drinks served in plastic champagne flutes, small plastic wine glasses (about 3 inches tall), plastic margarita cups that are taller and narrower than most plastic cups (about 5-6 inches), and 16-ounce plastic beer cups (about 5-6 inches tall).
If I had to choose the most common cup in EPCOT, I would say that it is your typical 12-ounce plastic cup, which is generally around 4-5 inches tall. But the most wonderful thing about EPCOT is the variety of delicious food and drink in all shapes and sizes. Cheers!
These cup heights are just estimates from my experiences sipping around EPCOT, but I hope it was helpful, Deborah! Please feel free to stop by any time with any questions you may have. You've got a friend in planDisney!
Blue skies and sunshine,
Mandy