Trying to make a bottle rocket out of a 2 liter soda bottle

Instructions I've seen says I need a pump, some paper to make the little cone shape of the top of the rocket and a cork. But does anyone have any ideas where to get a cork to fit a 2 liter bottle? Or what size I am looking for?

submitted by /u/UnluckyPhantom
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from DIY https://ift.tt/2LgQQNg