I have a 2 burner alcohol stove which I find is reliable and safe. Improvement if I could have it would be a little more heat output. Have a look at:
http://www.sailnet.com/forums/general-discussion-sailing-related/21807-propane-alcohol-stove.html
http://www.sailnet.com/forums/general-discussion-sailing-related/21807-propane-alcohol-stove.html