Choice 1 Resources-Egg Passenger
Check these out if you're researching Choice #1. You will also have to do your own research on this topic.
Choice 2 & 3 Resources-Fin design and shape
Check these out if you're researching Choice #2. You will also have to do your own research on this topic. For Choice #2, you're looking for the fin shape that works the best. For Choice #3, you're looking for where the placement of the fins should be to launch your rocket high into the air.
Help with scientific explanation
These resources list the science concepts at work when launching water bottle rockets. These resources are to help you get more background information so you can explain your data, and integrate your knowledge of all the science concepts in your explanation.