I think you are going to waste your time sir. I have tried it without much luck. The engine simply does not produce enough heat. You are welcome to try though, get some copper or brass tubing and coil it everwhere you can heat from before you let the fluid get into contact with the exhaust. I have heard people wrapping the tubing around the head of the engine and coiling it up around the exhaust will help alot as well. Then you will need to get the fluid in as close as safely possible to the head of the engine. In other words right next to the head without injection it into the head of the engine itself. You can do a very easy search on RCU in the large scale sections and even here in the 3D forums and you will find alot of info on pumps etc. You will also perhaps need to play with different mixtures of fluids to help the process out in your case.

I can not give you solid advice on where to get what but IMHO you are going to waste your time. Gassers have been proven over and over to be the only engines to fit the bill, but if you are in for a challenge....go for it!