Advice needed for producing a water powered car model project

[aliiiaaa_x]

TL;DR Summary: We were tasked to create a water powered car for a project for engineering design and the main specifications is as follows, it must hold 0.7L a min of water. For the first run it must move as far as possible with 0.5L of water and then on the second run it must be able to move between 3 to 5 m with an unlimited amount of water

So far we created two designs. The first design was a three CD wheel car. The back wheels had a water wheel and a sort of funnel to pressurize the water onto the wheel to make the back wheels turn to turn the front wheel but the water wheel was not moving when water was released onto it. It also did not have sufficient storage as water was released to push the car
The second design i lifted the waterwheel, and created a separate axle for the back wheel, adding another front wheel so there are 4 wheels in total. I created a sort of a pulley conveyor belt system where if the waterwheel turns, the first pulley turns with it and therefore the second pulley turns the back wheels making the car move.
But the waterwheel on turns without the belt and with the belt the back wheels do not move.

Please help. We have this project due on wed and we have no solutions working as yet.

 

[Baluncore]

Welcome to PF.

Can you apply air or elastic pressure to the water, say in a balloon, or is gravity only permitted.

For maximum potential energy, raise the water reservoir, while keeping the water wheel low. Release the exhaust water backwards, (as a positive thrust).

Drive only one wheel or axle.
Avoid flat or 'v' belt drive, use a chain, stepped belt.

Provide a link to the rules of the game.

 

[aliiiaaa_x]

If another energy source is used, I must be able to prove that the produced energy is greater than the initial energy, I've enclosed the rules if you would please kindly assist.

 

[berkeman]

Since it was due on Wednesday (2 days ago), can you say how you did? What did the winning car look like?

 

[aliiiaaa_x]

Since it was due on Wednesday (2 days ago), can you say how you did? What did the winning car look like?

It moved 2.5m on the first run and 3m on the second, it was quite a marvel, my teammate had incorporated some of the previous designs we did and created this.