If you're on a dining plan and have a refillable mug, you will be able to get it filled, and an addtional drink. DW & I went to PM for dinner a few weeks back (great meal, btw), and had our mugs filled as well as getting a bottle of water to go (drink from qsdp credit) on our way out. Your server will let you know that this isn't "cheating the system," so don't worry about that. Enjoy!!