Normally not something you would do unless you want to help a tank cycle or test a cycle or you were going with a fish less cycle.

The first thing to do is get a source of ammonia, while many different products will say pure ammonia or clear ammonia or only list ammonium hydroxide or ammonia as an ingredient most of the ones available commercially have surfactants if not other perfumes and what not. Even if you think something is just ammonia the easiest way to test this is to shake it. If it foams at all or if bubbles form and don’t disappear in seconds you have ammonia + a surfacant. () pure ammonia can be found at ace hardware, while there are probably other places you can find this, this is where I know you will get a pure ammonia.