potato cannon science project?

what kind of propellant is the best (shoots the furthest) and what is the cheapest one that works? Pretty much its any kind of aerosol spray that is flammable. Where can i get them and how much does it cost?
I’m not some crazy kid its a science project for school on which one will launch the potato the furthest.
Thanks in advance
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I just used hairspray and it worked pretty well. You can get it at any grocery store or drug store for a few bucks a can.