You need to put pure water in a clean container and then process it in some way to eliminate bacterial contamination. You can process the water with heat just like you do when canning, or use a chemical like chlorine or iodine.
That said, from what you are describing several causes come to mind. They are deviated septum, vasomotor rhinitis or nasal polyps. It sounds like you might have a nasal polyp on the right side of your nose. A nasal polyp is noncancerous, sac-like over-growth of inflamed tissue lining the nose or sinuses that can block nasal airway. Since it is the same side all the time, you might also have a deviated septum that occurs when the thin wall between your nostrils is displaced to one side, making one nasal passage smaller.
Topics | Ear, Nose and Throat | Nose Disorders | Why does blowing your nose cause nose bleeding? The inside of the nose is lined with tiny little blood vessels. When a person has a cold or allergies causing a runny nose the inside of the nose gets red and irritated (inflamed). This swelling inside the nose and irritation causes the thin lining of the nose that covers these tiny blood vessels to thin even more making the tiny blood vessels closer to the surface.