Bring your dog’s regular food. You can simplify things by pre-packing his meals in individual bags or plastic containers. Also bring plenty of treats. Your dog will enjoy snacking along the way just as you would!
A pet first aid kit is always a good idea, whether on the road or at home. Here is a good article that details what you should have. http://www.humanesociety.org/animals/resources/tips/pet_first_aid_kit.html?referrer=https://www.google.com/