You can fishless cycle a tank in a number of ways! Ammonia isn't the only one, but you definitely won't need "a few bottles". You probably won't even need a whole one.
At work we cycle with ammonia (or ammonium sulfate) and sodium nitrite.
My favorite way to do it fishless is to simply add some food to the tank and let it rot. It's cheap, easy, and difficult to overdose.
Peeing also works. Urea will break down into ammonia.