Canadian whisky's are a blend of different grains. Corn Rye and Barley and i agree with the page I've attached that the water source used will affect or inpart a certain distinctivness to the type of whisky produced.
But to your question please follow this link as this should give you a good idea of the "tuffs that dreams are made of."
Enjoy!!!
http://www.city.waterloo.on.ca/seagr...ry/making.html