How do most schools accomodate children with food allergies?

Lunch tables. Most schools provide a peanut free table for students with peanut allergy to sit at. They often have a friend that agrees not to bring peanut to school that is able to sit with them.
Many ways... Schools typically identify children with food allergies and school nurses communicate with the child's allergist to develop a "food allergy action plan" that delineates what needs to be done for mild through severe/anaphylactic reactions. Food labels are read carefully. If indicated, children with severe food allergies may be seated separately in cafeteria. Child psychologist may also be helpful.