Abt 1/4 tsp Xylitol, 1/4 tsp sea salt, and enough warm water to fill a 4 oz or so spray bottle.
It’s supposed to help quite a bit with ear infections as well, I don’t have ear problems but sometimes in the spring my sinuses act up a bit, and it seems to work way better than plain store-bough nasal spray.
I will have to try it.
Have you tried colloidal silver in a spray?
I’m prone to sinus problems, and this has prevented said problems since I’ve started using it.