We loved Coronado but found the refillable mug a bit useless there. Honestly it even took us several days to even go get it in the first place because we never went to the main building.
I think also cafe rix which is in the main building as well. As pp has said you can also get a refill at the main pool area which wouldn't be as far of a walk. You could also hop on a bus at one of four stops to take you to the main building.
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.