My teenager was diagnosed with Celiac disease shortly before COVID hit. We have very little experience ordering food away from home. I thought that Disney would be easy to figure out, but this thread has me re-thinking that. Honestly, the thought of feeding him for 3 weeks (2 at Disney, 1 at Universal) is really starting to worry me.
Don't worry, it's going to be ok..
WDW is one of the best and easiest places to feed a celiac anywhere in the world. For me, it's the second safest, right after my own kitchen.
You still need to be aware and be ready to ask questions when you have to, but Disney takes allergies (I know Celiac isn't an allergy, but that's the terminology they use) very seriously.
The system isn't perfect, so you still have to trust your instincts when something doesn't seem quite right. I have one (and only one) example from my 3 trips since the reopening. It happened just last week at Harambe Market in Animal Kingdom - I ordered from the allergy menu and was suspicious when it showed up as being ready less than 2 minutes later (allergy meals usually take longer than regular ones, typically around 10 minutes).
When I got to the counter to pick it up, there was no allergy stick in the food like there usually is. I asked the CM about that and she said that the meal was naturally gluten free, meaning it has no gluten ingredients.
Here is where I made my mistake - I was too hungry and my diabetic husband (who is also gluten intolerant) needed to eat right away and so I just took her word for it. I should have asked to speak to a manager or chef to find out if any procedures were in place to avoid cross contamination. Hubby and I both had glutening symptoms after that meal.
So the lesson is, be alert, ask questions when you need to, but that was one meal out of the dozens I had, and it's the only time I had problems.
I don't have any experience at Universal, so I can't speak about that, but if I were you I would go to the Universal boards here on the DIS and ask. You can also read reviews about the Universal restaurants on Find Me Gluten Free (either the app or the website).