You get a spray bottle with water and mix a couple spoons of sea salt in the water bottle. Mix well so that the sea salt is dissolved.

what is used to test for the presence of salt in water

Sea salt spray give you a natural beachy wave to your hair. the salt from the spray is absorbing the moisture from your hair and that give a pull in the hair to get the waves in your hair. this is a physical change to the hair and it can be broken by adding water to it and to regain moisture back into the hair.

It depends on why the shoes are "smelly". If it's because your feet sweat a lot, you can spray your feet and the inside of your shoes with a mineral salt spray (found at health food stores). Or, you can make your own salt spray: just mix about 1/4 cup regular table salt with a quart of warm water and pour in a spray bottle. The salt acts as a safe, natural drying agent. Salt also helps kill bacteria, which is what causes the odor. When you spray the inside of your shoes, be sure to give the salt water time to dry completely before wearing. You can spray them at night before wearing them the next day. Another thing you can try: brew some regular tea a little stronger than you would for drinking (such as Lipton) and soak your feet in it. The tannins in the tea act as a drying agent also. But I would not spray shoes with it.

Nose spray has oxymetazoline in it. This is the ingredient that makes it work. It definitely does not show up in a drug test!