Add 1/2 teaspoon of baking soda to 1 teaspoon of ascorbic acid in a few ounces of water. This is close enough to sodium ascorbate to get the job done. Wait until the fizzing stops. (The exact proportions to make sodium ascorbate require a gram scale.)
I think Pauling mentions the nasal application on p. 31 of HTLLAFB?
"Unless we put medical freedom into the constitution...medicine will organize into an undercover dictatorship..force people who wish doctors and treatment of their own choice to submit to only what..dictating outfit offers." Dr. Benjamin Rush