I have looked at a couple of these "generators" and some of the guys appear to be boiling the water.
What you might want to look at is a stable tank with salt water in it. Water does not conduct electricity...contrary to what you have seen on TV, it doesn't. SO, you need to add a "free Ion", like salt.
Then you will need two plates, stainless steel if you can ( the salt will take longer to rot them ) They need to be separated with a good electrical connection to the top of the stable tank.
You will also need a pressure bleed off valve like the one on a weed sprayer and last, you will need a hose.
So, you mount the plates in the tank at ends. Mount the pressure bleed off valve and connector for the hose to the top.
Put salt water into the tank and connect a 12V battery. The gasses coming off out of the hose connector is very combustible. Pipe that into the intake on your engine and away you go.
Here are a few things you should know.
1. most current production cars get great performance improvements from this, but the mileage is usually not that good...for gas. It is because the computer that controls the A/F mixture can not compensate for the Hydrogen and added Oxygen.
2. Many cars run hotter as the A/F is not at the 13.5 to one, but higher.
3. Aluminum engines appear to have problems with the heat and salt ( didn't understand this comment, but I figured I'd pass it on )
Check the internet for articles written by people that have tried this.
