The Food in the park is already there. Go to the information area and ask where the Kosher Food is.
When you get to the restaurant , you have to ask to see the Kosher Food menu. They will then get it for you
Its all double wrapped airline food
I ate it at the magic Kingdom and Animal Kingdom
It was Meat at the Magic Kingdom and it was Pizza at Animal Kingdom.
but there is Kosher food at Epcot and Hollywood Studios as well.
Disney is well aware that many people who keep kosher go to the park. You will see lots of frum people there. I even saw chassidim there