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.
Causes of a nosebleed. The inside of the nose is delicate and nosebleeds happen when it's damaged. This can be caused by: picking your nose; blowing your nose too hard; the inside of your nose being too dry (because of a change in air temperature) Nosebleeds that need medical attention can come from deeper inside the nose and usually affect adults. They can be caused by: an injury or broken nose; high blood pressure; conditions that affect the blood vessels or how the blood clots; certain medicines, like warfarin; Sometimes the cause of a nosebleed is unknown. Certain people are more prone to getting nosebleeds, including: children (they usually grow out of them by 11) elderly people; pregnant women; How to stop a nosebleed yourself. You should: sit or stand upright (don't lie down)