The full answer
Clear communication and a written care plan
A written 504 plan or similar accommodation plan (common in the US) can formally establish gluten-free meal provisions, safe snack policies, and cross-contact precautions in the classroom and cafeteria — putting expectations in writing helps consistency across substitute teachers and staff changes.
Everyday classroom precautions
Practical steps include keeping a stash of safe snacks at school for unplanned situations (like classroom activities involving wheat-based Play-Doh), briefing staff on cross-contact basics, and having a clear plan for parties or shared food events where ingredients aren’t easily controlled.
Important context
Individual symptoms, reactions, medical histories, food products, and local labeling rules can vary. Community experiences are not medical evidence.
For personal medical decisions, diagnosis, testing, or treatment, consult a qualified healthcare professional.