Water Rocket Parachute Deployment Ideas

[AlaskanPow]

Homework Statement

Hi guys, I'm working on my water rocket this weekend, and have done most of everything except the parachute deployment. I'm trying to come up with some ideas on how to deploy my parachute. I don't have access to any sort of timer or computer device to deploy it, so am wondering if anyone else has some good ideas on how to deploy it.

Homework Equations

The Attempt at a Solution

 

[staysys]

The only thing I can think of is to have the tip of the rocket weighted such that when the rocket comes back down the tip points downward.
Then you can just pack the parachute in a way that once the rocket flips upside down the parachute can come out.