Hi Dan, here goes......
All you need is a small reservoir, a small computer chip cooling fan, some NI-Chrome wire (heating element out of an old hair dryer will do), a short length of dowel or similar, a small piece of WOVEN fibreglass cloth, 12 volt battery, disco fog fluid (available from Maplins), plastic or copper tubing for the flue to the funnel and a couple of screw block connectors.
To work out the length of the Ni-CH wire needs a bit of trial and error to get right, you need the wire long enough for the fog fluid to burn off but not get red hot.
Next, wrap the glass cloth around the dowel to act as a wick and spiral the Ni-CH wire around that making sure the wire doesn't overlap. Use the choc. block connectors to connect the power feed wires to the Ni-Ch wire (solder doesn't work for some reason) and place dowel at an angle in the reservoir with the wick in the fluid but not the element. Secure the computer chip fan to the reservoir. Fill the reservoir with fluid up to the bottom of the element and connect up the power and switch on.
I have done a schematic drawing to try to explain how I did it, it's easier than it looks.