Wodrick.
Sorry to cause you some confusion but I don't think they are totally different.
Water causes the air to be cooled and increase in density.
Then we want to increase the power by adding fuel. This can be done either by opening the jet fuel tap to add more or using Methanol mixed with the water to do the job.
Yes, as far as I know, Jets use Demin water and add more fuel and Turbo-Props use Water/Meth, but I'll bet there are examples of use the other way around.
Yes, if you put Water/Meth or Fuel in the water tank the engine will overheat and bits will melt, as with the PanInternational BAC 1-11 that I had worked on only a few days before the accident.