First, we decorated our empty soda bottle to look like a rocket. I made a template for a fin and the kids cut some out of cardboard and taped them onto the bottle. Next, I made a cone shape out of some cardstock and that got taped to the top of our rocket.
They then started to spray paint their rocket and added some more paint detail with acrylic paint.
Now for the launcher! I just Googled how to make a launcher and found a design online. Here is a link to the PDF: How to Make a Soda Bottle Rocket Launcher
I went with this design because it seemed easy enough to make and gather supplies for. I got all the PVC, connectors, and PVC cement at the hardware store for about $12, and the tire valve stem at the auto parts store was $4 for two of them. My son cut all the PVC himself and was able to follow the directions on his own to cement all the connectors on. We used a 3/8" drill bit to drill a hole for the valve stem and ended up having to add some plumbers tape on the male adapter that the soda bottle fits onto just to make sure there were no leaks and that we had a good tight seal.
Voila!! All done and ready to launch!! Check out our launch below!