My DS3 is allergic to 18 different things and was able to eat the popcorn on the last trip. Basically, he allergic to shellfish, garlic, peanuts, soy, eggs, grass, trees, dust, mold, cockroaches, ect. I only list the "food" allergies on our ressies when I make them. At each restraunt we've been to, the chef's come out and told us exactly what was safe and what wasn't. At Chef Mickey's they made him some Mickey waffles instead of chancing taking the ones off the buffet which were next to something with peanuts. We never had a problem with CS or snacks either.
Have a wonderful trip! I can't blame you for not trusting someone else answer on the food and what's it in. It amazing me when you go someplace and ask about peanuts or garlic and servers or managers don't know the answer!