This setup is very easy to build and it will cost you less then 10$. You can see the effect of burning water right away. The spark is louder and brighter when you spray some water on to the tip of the spark plug. The primary voltage supply in this video is 10 Volts. You can use a 9 volts battery. Sp the next step would be to build an engine running on water ...? Chek: Ossies simplified water explosion experiment at Panacea-BOCAF On-Line University, http://www.panaceauniversity.org/Water Spark Plug.pdf

TojRE