Leash, ID tags, pooper scooper and plastic bags. Dog toys that will keep your dog entertained. If you are going to be staying in motels or hotels call to make reservations and be sure they accept pets. If you dog gets motion sickness here are a few tips that might help. Take him on short car rides before the trip begins to get him used to the motion.
Many puppies get care sick but usually out grow it.
If he is in a crate cover it with a blanket to encourage sleeping. Do not feed the dog for 2 hours before the trip and no water 1 hour before. Do not let him look out the window as moving objects could make him sick. It stops the dog from getting into trouble while you are driving, and the dog cannot escape when the car door is opened. He will be secure in an accident which is much safer for the dog and for any people that are in the vehicle.