Cut two triangular paper fins and tape them onto the rocket.
Make a small paper cone and tape it to the top of the rocket if you would like a nose cone.
Hold the rocket upside down and add water to the canister to one-quarter full.
Add half a tablet of Alka-Seltzer to the film canister and quickly snap on the lid.
Place the rocket on the ground, lid down. Stand back and count down while you are waiting for launch.