We're in the final planning stages for our 2nd trip to WDW this December. 
We have a very picky 4 year old who's diet is pretty limited due to some severe allergies he had as an infant.
Is it completely frowned upon to bring a CS meal from somewhere else that we know he will eat to a TS restaurant?
I've tried my best to book adr's at places that he will pick something off the menu, but there are places we'd like to try that I know he won't eat anything from.
Will they allow "outside" food?
Thanks for any advice!!

We have a very picky 4 year old who's diet is pretty limited due to some severe allergies he had as an infant.
Is it completely frowned upon to bring a CS meal from somewhere else that we know he will eat to a TS restaurant?
I've tried my best to book adr's at places that he will pick something off the menu, but there are places we'd like to try that I know he won't eat anything from.
Will they allow "outside" food?
Thanks for any advice!!