I do not know about calling, but you can start with the normal dining res number (WDW DINE). I know that many TS places have the cooks/chefs come and discuss allergies with you, had them do that for us in the past. For CS I think there is a list of "what's in what" but I am not sure if it is available at the place itself, or if you can get it at the park's Guest Relations or at any GR. Hopefully someone else here will have more info. Good luck.