What are the sizes of the fountain drink cups?

[Perdita&Pongo]

How many ounces are the 2 sizes of cups for the fountain drinks in the parks?

I searched many possible combinations of "fountain" "drink" "cup" "size(s)" "ounces" and found nothing. I can't believe this questions hasn't been asked before.

 

[tomatecerise]

In dining plan it's the 20 ounces that you can have (i think it's The medium)