Fill it up!

If you love to stay at the beach, and you ordered drinks from them,do they allow to pour it in your own cup?( Just in case you have your own cup with you).

I'm sorry are you referring to drinks bought in a resort and you are planning to transfer the drinks to your own cup? If that is the case, of course you can do that I believe the resort staffs wont mind. Just curios, why do you want to transfer your drinks? Wouldn't be a hassle bringing your own cup every time you go to a restaurant or a resort?