Sure. There are water fountains around the parks, including a few of the newer type that allow for easy bottle refills. You can also ask for cups of complimentary ice water at any counter service restaurant. There are also a few locations that have self-service drink stations that include a water option.
Honestly in my opinion if you’re not staying at the resort often the mug isn’t really worth it. But since it comes with the DP I guess it’s also not a huge waste. But we only used ours sparingly at AS Movies
I like to resort hop, so I bring my mug everywhere, it's also convenient last thing at night to get off the bus and grab a hot chocolate or hot tea at the food court before going back to my room as I always have a hot drink when hitting the hay.
I like to resort hop, so I bring my mug everywhere, it's also convenient last thing at night to get off the bus and grab a hot chocolate or hot tea at the food court before going back to my room as I always have a hot drink when hitting the hay.