Water Bottle Rocket! (only Around $7)

i will show you how to make an awesome rocket out of a regular water bottle and a can of air duster.

this part is simple. all you have to do is cut the top off of a water bottle right above the label. stuff the part you just cut off into the cylinder(pic 2) then cut a hole in the bottom of the cylinder just big enough for the air tube thing to fit into.(pic 3)

all you have to do now is insert the tube and squeeze the trigger and BLAMMO!!!