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Yes… you can put boric acid in a nasal spray bottle. Be sure to adjust dilution ratio.
In the pre-antibiotic era (before 1940) borid acid derived from boron, both were front line defense against microb's. Possessing antibiotic properties against both fungal and bacterial infections.
A good book to read that is free on google books is “Borax the Magic Crystal 1915”. It will teach you how our Grandparents used boron.
Sinus Infections, Loss of Smell and Taste
Can I put that in a spray bottle and administer it like that instead of a neti pot?
Rerards