Boiled water is heated to kill harmful bacteria and microorganisms but may still contain impurities. Distilled water is boiled and then the steam is condensed, resulting in water free of most contaminants. Tap water comes directly from the municipal supply and may contain minerals, chemicals, and other impurities depending on the source.
It's best to see a doctor for medical advice even about OTC remedies. I am not a doctor. That said, if one set of OTC remedies doesn't seem to be working it can be good to try others and, perhaps, Flonase should be something to try. Obviously, for any OTC remedy read the package to make sure that it won't cause you any danger.
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