At the Disney Resorts there is a very good deal you may have overlooked. The Rapid Fill Refillable Mugs that are available at the quick service locations at the resorts could save you a bundle of money. As of 2016 the cost is $16.99 plus tax for the length of stay. What this includes is a plastic mug that has an RFID chip embedded in the base. This allows you to fill the cup with fountain beverages (soda pop, Powerade, lemonade, and water), coffee, and iced tea. The RFID chip and the chip reader have a timer which will allow you to fill your mug every 2 minutes.
There are mug wash stations which have a faucet and sink. However if you are like me and want to mix up your beverages my suggestion is simple. Take a new, dry sponge and put some dish soap on it. Allow it to dry out, then cut into pieces. When it is time to go on vacation put a few of these pieces into a baggie and you have soap to wash your mug!
If you purchase the dining plan you will get the refillable mugs as part of that purchase. You will just need to choose your mug and pay with your Magic Band.
Some other things you will want to know. You can use the mugs at any Walt Disney World Resort, but not at the parks. Do not microwave the mugs, this will ruin the RFID chip which means no more drinks. Your refills will end the day you check out at 11:59pm.
Why do I think this is a great value? The cost of single 20 oz drink at Disney is around $3.50 and say you need your coffee in the morning and then need a pick me up or some lemonade in the afternoon, and then again in the evening you need some Powerade to hydrate you are looking at $10.50 and that is if you are the only one getting a drink. Plus at the end of your vacation you get a cute new mug to take home! The mugs are very sturdy and will hold up to many times through the dishwasher as my 2013 mugs will attest.
In order to get a good value you will want to look at how long your visit it. Next you will want to look at your drinking habits, are you a morning coffee, tea or pop drinker? Are you going to be hitting up the refill station at least another time during the day? If you are going to go at least two times I day I think it is worth it. Especially if you fill it up twice in one visit to the food court. Plus if you think of it a partially a souvenir the cost is really reasonable.