Hi, Dianne! Thanks for coming to us with this question. I am living through the same situation with my grandchildren, so I feel you.
Walt Disney World does offer some limited accommodations for potty training toddlers. Unfortunately, there aren't potty seats or potty chairs available at any of the
Disney Resorts Collection Hotels. The one thing you will find exists at the
Baby Care Centers. There is one Baby Care Center at each of the theme parks, and it's at these pretty fantastic facilities that you will find toddler-sized potties.
As we both know, though, when your practically perfect potty training champion has to go, they have to go right this very minute now. You may not be conveniently located near one of the Baby Care Centers. I highly recommend a folding, portable potty seat. I keep one with me whenever I take my grandkids out. They fold small enough to fit into a diaper bag or backpack, and you just unfold them and place them on top of the regular seat. I keep a pack of sanitizing wipes with me, and once my littles are done, I wipe it down, fold it up, and pop it back into my bag. You can find the seats at most places that carry baby supplies or online at Amazon.
Dianne, I have one more recommendation. Most of the facilities at Walt Disney World are automatic flush, and that can be downright terrifying for a newly minted potty user. Keep a pack of Post-It notes in your bag. When you go into the stall, place a Post-It over the sensor so your little one doesn't get a wet and unwelcome surprise.
Happy travels, Dianne!
Anna