For the record, I don't think this is an accurate representation of the situation.

The world has done a remarkable job of coming up with ventilators, masks and new practices on the fly in the face of overwhelming demand and labor shortages.

The ventilators aren't working as well as expected, so doctors are collaborating via internet in real time to come up with other options. New hypotheses concerning the pathology of the condition are already emerging.

Also, with internet access, you can google up medically recommended airway clearance techniques, recommended OTC drugs, etc. You can double check that it's a reputable source and an established practice for management of lung issues.

Covid19 is not the first time people have been faced with managing deadly lung issues. You can find good info on that very thing by searching for resources for cystic fibrosis. It's very deadly and people routinely manage it from home with medically approved and doctor recommended treatment modalities.