you will do wonderful, i have never been blessed to see europe, but i have seen los angles at rush hour, the most important thing is the above list (food, blanket, water etc) and a good flashlight or too, friends to call like a flight plan in an airplane, and a good book, because if you are stuck somewhere and somehow, car breaks down and you have to stay where you had not planned, you will have something to read, i have driven from alaska to california, california to alaska, alaska to oregon, oregon to montana, montana to ohio, ohio to texas, texas to new mexico and back to alaska, not in one trip, but my last one was washington state to southern florida, southern florida to north carolina and now i am in back in florida. and if i can do it you can too, probably do a better job than i did. send us pictures of your wonderful trip.
and during part of these trips i was driving a 25 year old junker car, hand 2 small kids and an incontient dog. it was hysterical, be safe
jan in palatka