i will show you how to make an awesome rocket out of a regular water bottle and a can of air duster.
Step 1: The Bottle
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)
Step 2: The Firing
all you have to do now is insert the tube and squeeze the trigger and BLAMMO!!!