racedrvr,
Yes, the AMA Safety Code for RC turbine operation requires a water-based fire fighting system, typically an Indian Pumper or equivalent. These are available from fire fighting outlets such as the one you posted. However, note that you have to be in pretty good physical condition to quickly run to the crash site with the 5 gallon size. Some large jet events utilize a 4-wheeler or Gator to carry the pumper to the fire source. An alternative, used here in the northeast, are several smaller garden-type sprayers or deck stain sprayers which hold a couple of gallons and are much easier to haul. I used a 4 gallon capacity garden sprayer from Harbor Freight half filled to satisfy the requirement. Last season someone donated an Indian Pumper which also was half filled for ease of carrying. Fortunately, none of these were required for my own jet rally or the multiple events that I attended.
The best prevention is to shut down the turbine BEFORE impact which dramatically reduces the probability of a crash induced fire.
Rgds,
Art ARRO