You must have all the information regarding the working of hydrogen cells and a proper guidance for preparing them at home.
First of all, let us have a look at the materials that you require for the preparation. They include simple equipments like vacuum tube, quart jar, glass pieces, a few electric wires, baking soda, a container which can hold sufficient quantity of water etc. These are easily available and will not cost you much. You also need a guide for gaining knowledge about different steps involved in the process.
But these tips are not meant for preparing a device which will generate pure hydrogen for running your car with the help of water. Preparation of a pure generator of hydrogen is not only difficult but also dangerous.
You should have a thorough knowledge on the preparation and you can get all the required information from the internet. Before you proceed to do this, you should ensure the suitability of your vehicle to this type of fuel. If need be, bring about some changes to the vehicle.