For our DLR trips, we've always found it handy to take The First Years Take N Toss sip cups. They're dishwasher safe, yet disposable (yes, this does indeed mean that you no longer have to search under all the rows in ITTBAB to find the thrown cup, because you have a backup) and spill proof. They come in various sizes and you can find them at Wal Mart, Target, K Mart and the like. Amazon.com even sells a 24 pack (which I'll be getting for our upcoming WDW trip) for $11.99. As I was browsing in Target the other day, I also noticed that they now make Take N Toss bottles as well. They also make tablewear (disposable spoons and sporks (they're more like a spork than a fork to me)), and sealable snack cups. I'll be getting some of these as well. Regular tableware is still just too big for our 2.5 year old. Might want to bring along some disposable bibs for self feeding though 
. The first years also makes a "Diaper Duckie", a little duck shaped plastic bag dispenser for those diapers that don't wait for a changing station, or even to help with the smell in a hotel room or park bathroom. They're very small and handy to have around for more than just diapers. Very inexpensive as well. Anyway, I hope these help make someone's trip with a little one a little less hassle.
. The first years also makes a "Diaper Duckie", a little duck shaped plastic bag dispenser for those diapers that don't wait for a changing station, or even to help with the smell in a hotel room or park bathroom. They're very small and handy to have around for more than just diapers. Very inexpensive as well. Anyway, I hope these help make someone's trip with a little one a little less hassle.