How should I prepare my hamster for a long trip?

My family and I are taking a vacation to Toronto, Ontario. We are driving from Alberta. It will take us about 3 or 4 days to arrive. I am buying my teddy bear hamster a new, smaller, cage for the trip. Should I get her anything else? Should I be worried or cautious about anything? Please help. I get really worried that I may do something that is wrong for her.