Be careful on groceries crossing the border. Canada does not like meat, both beef and chicken products including eggs.
You could come almost straight north and cross using US 89.
I would suggest going west from Calgary and go up through Ice Fields and Jasper.
Pick up Can 5 to Prince George and Can 97 to Dawson Creek. The North to Alaska!
Get the Mile post as soon as possible. Each of you go through the routes you want to take highlighting what you want to see.
Run on the upper end of the fuel tank. Get fuel at larger communities.
My bank has partner in Canada. Exchanging money is getting harder. I crossed the border, hit the cash machine at affiliate for spending money. On returning south I counted up what we had left and put it in the fuel tank leaving no Canadian money. Used credit and debit card for fuel. Check with your bank to see if they have affiliate in Canada.
We returned south via the Cassiar Highway.
Did trip May-June of last year,2015.
Get trip! Take your time!