Schools already have to solve exactly these problems. Kids with known anaphylactic reactions have an epinephrine autoinjector and possibly a little pack of antihistamines in a baggie, with the kid’s name on it, in the school nurse’s office. And there’s a piece of paper (generally a standard-ish form that may or may not be comprehensible) with specific instructions for that kid. This being America, the kid’s doctor absolutely does not take the time to write clear instructions for that kid.

The only thing that I’m suggesting should change is to have a pile of epinephrine auto injectors (or nose sprays) supplied by the school, so the parents would instead just supply the instructions.