Where does one find food grade and is the stuff found for first aid in the brown bottle not pharmaceutical grade, which is an even higher standard for purity?
Ut can be found online but one needs to be careful and informed and read labels carefully. Food grade peroxide is typically 35%. It needs to be diluted properly and using saline, nit just distilled water
https://www.spiritofchange.org/nebulized-peroxide-a-simple-remedy-for-covid-19/