Water Bottle Rocket Launcher

In physics class I have to make a water bottle rocket, but I have no idea how to make a launcher for it. All answers or useful sites? Thank you very much <333

As a launch pad? You basically just need material "to mount the bottle upright. The easiest way would be to stick a piece of straw next to the bottle, and a straight metal rod about 0.5 m long the guide up.

When I did this project at school we only had to build the rocket. The teachers gave the pitcher. You can simply buy them. Building one would be very difficult because you have to use pumps and stuff like that. You should check that the launcher is still making the project so that you do not put much effort into this.