'O' No we need distilled water to operate it, something us guy's are short of
and some baking soda.
Just a little extract I took from the page.
We're not going to go over everything here. You'll get all the instructions. But here are the major factors you have to know:
SAFETY FIRST: First thing you have to understand is there are NO safety hazards - this system is SAFE. Yes, pure Hydrogen that is dangerous. And it is dangerous to store it in high-pressure tanks. But we do NOT generate Hydrogen, you see, we generate HHO. The presence of Oxygen and water vapor in our system makes HHO very safe! Yes, HHO is a powerful combustible gas. But it's NOT explosive like pure Hydrogen. It does NOT need cooling and will be ignited only by the strong spark inside your engine. This has been proven by many thousands of miles of road tests in harsh weather and road conditions.
Again, we don't generate Hydrogen; we generate HHO - and also WE DO NOT STORE IT. All HHO produced gets consumed by the engine right away. Bottom line: unlike "Hydrogen Cars" this system is VERY SAFE.
MAINTENANCE: Little service needed, maybe 5 minutes a week. You will get easy to follow instructions. You need basic technical skills or someone to do it for you. What's needed? It is recommended that you inspect it weekly, add a bit of water (? cup a week) and every 3-6 weeks put 3 cups of distilled water and 1 teaspoon of Baking Soda. More maintenance is rarely needed. We do not supply parts; those can be obtained very cheaply from hardware stores (catalog numbers provided for your convenience) so you can enjoy this technology for many years with very little expense.
SPACE REQUIREMENTS: The minimal space required for installation is 3.7 inch wide (9.4 cm) by 8 inch tall (20.3 cm). You should have easy access to the device. Ideal places we have found are near the washer fluid, the battery or in front of the radiator.
The system you will learn is very easy - you can make many copies of it. Per our policy of "Open Source" you will get instructions and cheap resources to fully duplicate this system and create more Water4Gas units for your friends - using only easily obtained hardware and simple tools!!! NOTHING is hidden or complicated. The Power Of Simplicity is at your service!