There are special offers at certain schools. If there are certain needs for Your child, you might be asked to provide the food needed.
If Your child need medical treatment, please contact the headmaster and the staff. It is possible that teachers assist with medical treatment on a voluntary basis. For details see https://www.schulministerium.nrw.de/docs/Recht/Schulgesundheitsrecht/Chronische-Erkrankungen-und-Diabetes/2016-07-01---Handreichung-zur-Medikamentengabe.pdf