How can you crush a bottle without squeezing it?

My science teacher gave individual problem statements to each student or group and this was the one I was given. She also gave the cl some vocabulary words, and I got "Air Pressure". I believe that you can crush the bottle by sucking the air out with your mouth but my teacher says you can't touch it. My friend told me that maybe you can ignite fire in the bottle to suck the air out but it wouldn't be possible because the bottle can melt if it's plastic. My teacher told me so to. So I'm thinking that there has to be some type of machine, instrument or something that can be put at the mouth of the bottle to suck out the air. Please help? I have no idea.