"Five-Minute DIY Water Bottle Rocket Materials You'll Need Plastic bottle (2-liter soda bottle works well) Cardboard or foam board Scissors Duct tape Water Optional: Fins (cardboard or plastic), nose cone (plastic bottle cap) Step-by-Step Tutorial: 1. Prepare Bottle: Remove the cap from the plastic bottle and set it aside. 2. Create Launcher: Cut out a piece of cardboard or foam board large enough to support the bottom of the bottle, and cut a hole in the center for the neck of the bottle to fit through. 3. Attach Bottle: Insert the neck of the bottle through the hole in the launcher board, ensuring it fits snugly. 4. Secure Bottle: Use duct tape to secure the bottle to the launcher board, wrapping it tightly around the neck of the bottle and the edges of the hole. 5. Fill with Water: Fill the bottle about one-third full with water. 6. Optional Additions: Attach fins to the sides of the bottle for stability during flight, and add a nose cone to the top for aerodynamics. 7. Launch: With the bottle securely attached to the launcher, quickly stomp on the launcher board to build up pressure inside the bottle and launch it into the air.4. Secure Bottle: Use duct tape to secure the bottle to the launcher board, wrapping it tightly around the neck of the bottle and the edges of the hole."