Your assignment (should you choose to accept it) is to find the best cup holder out there for our TravelScoots. If you do a google search for "Microphone stand cup holder", "bicycle cup holder" or "wheelchair cup holder" you'll see many options.
I don't think attaching a cup holder to the handlebars is going to be an option, which makes me think the microphone stand cup holder might work best, since it can be attached to a vertical piece. My sister Rae is the one who came up with this idea.
Here's one product that might work. Look at the SwirlyGig II.
Has anyone found other accessories that work with the TravelScoot?