Results / Conclusion

Apparently, pouring the water into the bottle before adding the dry ice transfers the kinetic energy from the water into the dry ice, making the sublimation process faster. The gas builds up and so does a high amount of pressure. When the pressure gets high enough, the bottle explodes, therefore exploding the watermelon. But when the process is reversed, and you pour the water onto the dry ice, the water is instantly frozen, and no pressure is built up.

Overall my question was answered. You cannot reverse the process, and there is only one way you can do this experiment. It was fun to blow up watermelons with my partner emma. The project was a success. It was very easy to accomplish and a lot of fun to do.