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.
The appearance of pimple inside nose can be symptomatic to underlying body conditions. Digestive system problems can cause the pimple to appear on the tip of the nose due to poor absorption of certain nutrients into your body. A bump or pimple in nose can also result from folliculitis. This is an infection of the root hair mainly caused by staphylococcus bacteria. Other types of bacteria and other pathogenic micro-organisms found in the nose can also cause an infection the leads to pimples. Pimple inside Nose Causes. Knowing the different causes of pimple inside your nose can help you to come up with an effective treatment or cure.