Q:

How to describe buying a drink with a cheaper price when buying a meal set

I'm a HongKonger and my mother language is Cantonese (A kind of Chinese?). 
I just wonder the sentence that I read on the restaurant menu is correct. 
"Upon Purchase Of Above Set, Can Enjoy Premium To Purchase Set Drink"
It is quite hard for me to understand the meaning of the above mentioned sentence if I did not read its Chinese version.  Is it the right way to present its true meaning? 
I'd like to translate it as below:
"Enjoy favorable price for set drink on purchasing any of above meal sets." 
Can you understand form my translation? 
Or is there any better way to present?  

A:

While your translation does not make use of words commonly used in advertising, the meaning is understood. 
In the US, we refer to this as a "meal deal".  It would be presented something like this:
MEAL DEAL: Get a large drink for the price of a small, with purchase of meal.