"Five-Minute DIY Bottle Rocket Launcher Materials You'll Need Plastic bottle (2-liter soda bottle works well) Bicycle pump with needle attachment Cork Duct tape Water Optional: Rocket fins (cardboard or plastic) Step-by-Step Tutorial: 1. Prepare Bottle: Remove the cap from the plastic bottle and attach a cork to the opening securely with duct tape. 2. Fill with Water: Fill the bottle about one-third full with water. 3. Attach Pump: Insert the needle attachment of the bicycle pump into the cork, ensuring it forms a tight seal. 4. Pump Air: Use the bicycle pump to pump air into the bottle, building pressure inside. 5. Launch: When ready, quickly pull the pump needle out of the cork to release the compressed air, launching the bottle rocket into the air. 6. Experiment: Test different amounts of water and air pressure to see how they affect the height and distance of the bottle rocket. 4. Pump Air: Use the bicycle pump to pump air into the bottle, building pressure inside."