Amish:
In the beginning of the movie " A Bridge Too Far " they show the Allied Universal Carriers with flame throwers (aka Wasps) that were used in Normandy to clear a path to either side... in those pics you can see about how much range they had... and the 'format' of the stream as it went out.
" Researchers at Harvard (in 1942) found that mixing an aluminum soap powder of NAphthene and PALMitate (hence Napalm), also known as napthenic and palmitic acids, with gasoline produced a brownish sticky syrup that burned more slowly than raw gasoline. This new mixture of chemicals was widely used in the Second World War in flame throwers and fire bombs. On July 17, 1944, napalm incendiary bombs were dropped for the first time by 14 American P-38 Lightning aircraft of the 402d Fighter Squadron / 370th Fighter Group on a fuel depot at Coutances, near St. Lô, France. Napalm B is not actually the original form of napalm. Rather, it is usually a mixture of the plastic polystyrene and the hydrocarbon benzene. It was used in Korea, and in Vietnam. Napalm 877 was used in flamethrowers and bombs by American and Allied forces to increase the deadliness of its predecessors. This substance is formulated to burn close to a specified rate and also to adhere to surfaces. Napalm B is mixed with gasoline in various proportions to achieve this. "
(Wikipedia)
Bottom line: It'd be hard to replicate decently short of a something that shot thickened butane or naptha, and that would preclude its use on the battlefields, as it would endanger spectators, and almost anything else. These kind of things are left for those nutty Germans who are allowed to have 'live fire' events... with flamers, rockets, and the like.
I'd say... better left alone...