I am positive that the mugs come with the dining plans now, both the table service and the quick service.
I am sure you can share a little of your beverage with the under three year old in her sippy cup (or just buy the child a milk or juice if they don't drink soda) and pour into the sippy cup.
Of my 30 plus trips, I have only purchased mugs one time...seriously. Since I fly and take a town car service for my transfer, I get a grocery stop and I purchase all of my juice, water, milk, soda and beer then. I always hated the thought of constantly remembering my cup, having to take it back to the room, etc. I see so many people who cart them along in the parks thinking that every beverage they purchase their entire stay will be free if they have their mug, even though it clearly states "this stay, this resort." HATE seeing people bring back their old mugs from previous trips. Wow, where did THAT rant come from? :lol: