Alcohol burns with a pale blue flame which is really hard to see in places that have a lot of ambient light, like outdoors. This will give the flames a yellowish color, making burning spills easier to detect. Butane fired engines are often set up to be refueled from convenient cigarette lighter refills, which are available just about everywhere that sells tobacco. However, if you run your engine often, you may wish to consider purchasing an adaptor that will allow you to refuel from the larger butane cylinders sold as camp fuel in some outdoor stores. To help extend the life of your boiler, use distilled water instead of tap water.
Tap water contains many impurities such as iron, sulphur, phosphorus, even chlorine.
These things are left behind in the boiler when steam is produced. These deposits create problems in two ways. First they interfere with the transfer of heat within the boiler, reducing the steaming ability, while increasing the chances of overheating the boiler sheets. Second, the deposits will retain moisture against the metal when the boiler is drained, promoting oxidation. De-ionized water has had any chemically reactive molecules called ions removed.