Don't get to stressed out about ingredients, as most are pretty common. You'll want fries, brown gravy, and cheese curds. We made poutine at home for Canada Day and added green onions, sauteed mushrooms, and bacon, too. I'm lazy and grabbed frozen fries and packets of gravy mix, and it turned out delicious. The hardest ingredient to find is typically the cheese curds, but a lot of grocery stores will carry those over in the deli/fancy cheese area, so check there. In a pinch, I'll cut mozzarella string cheeses into chunks, as that's close-ish. Good luck!