COVID AND THE VACCINE - TRUTH, LIES, AND MISCONCEPTIONS REVEALED, page-67264

Interesting re the salt water.
Re being outdoors, you only get adequate amounts of D from the sun in summer.
Some of the doctors like Peter McCullough say that the rona first establishes in the mucosal linings of the nose etc, and that if you get in early, you can knock it out before it drops down into the lungs, he advises a nasal rinse and gargle with Povidone iodine (Betadine) other antivirals include the nasal spray Xlear ( which I used) and Cepacol mouth wash.