That comment makes you seem really ignorant no offense. Canada is very similar to the USA in most respects. And on the issue of milk, most of us drink pasteurized milk as well, however the industry is more tightly regulated in terms of what hormones and crap can go into our cows.
Even still, I'm not convinced that there is anything wrong with milk. However, drinking 3 liters sounds a bit excessive. It depends on your tolerance to milk really.
You need water in your diet. If you like drinking milk cool, but make sure you drink water also. I ually have two glasses next to my plates of food. One with water and the other with the other liquid I'm drinking. 1 liter of water is not a lot btw. I usually drink 1 liter during my workout along with my protein/carb drink.
I have relatives in SK and it seems common place over there, although you are right it may be ignorant to assume that's the case everywhere. I do imagine it would be a lot easier to find if you looked considering how many farms there are.
I drink a gallon of whole milk at times and if I don't drink an equal amount of water I get dehydrated but I also live in the dessert for what its worth so you may not experience the same effects I do.
I drank 1 1/2 gallons of whole milk a day for about 2 months. I gained about 15 pounds, I'd guess about half of it was muscle. I felt like shit and my skin looked bad, but it helped me break a weight plateau.
Honestly, I think a lot of people put too much emphasis on drinking straight, unadulterated water. Milk is almost all water anyway. It's like not counting a vitamin in a certain food towards your daily total for that vitamin. It's still there, and you're still taking it in. This doesn't mean that one should completely replace drinking straight water with milk, but it is alright in my book to drink a little bit less water if you account for some of it being in milk.