Rimstar has some instructions on making a simple water bottle rocket, and the video below dives further into troubleshoot tips based on your design needs.
Here’s how to make a bottle rocket, a rocket that’s simply a soda bottle partly filled with water and compressed air that actually flies. As you can see below, you’ll need some sort of launching system, and that’s where the work in making one comes in.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.