I can't see Disney doing this. First, you get a drink with your dining plan meals. Second, if you want more drinks or are paying OOP for drinks at the parks, the cost runs $2.59-$2.89. Why would Disney sell drinks for $.99. Third, this could start a refillable mug black market and pathway for transmission of sickness. Fourth, somebody's mug with their germs on it can't be re-filled at a restaurant by employees. Against health codes. (Makes me wonder how refilling one's used mug at self-serve beverage stations affects sanitation...)