https://www.hindawi.com/journals/ecam/2021/5592042/
They used hydrogen peroxide to successfully treat the signs and symptoms of patients diagnosed with COVID-19 [9]. They base their treatments on a combination of oral, intravenous, intramuscular, and nebulized hydrogen peroxide. Their approach has resulted in zero deaths and the recovery of 107 COVID-19 patients [9].
you can add OTC peroxide to your water.
A nebulizer is inexpensive to buy.
you don't need to buy food grade peroxide and dilute it like some sources say
Check out Bill Munro's story on earth clinic. https://www.earthclinic.com/coronavirus/hydrogen-peroxide-inhalation.html