my suggestion... if you are scatterbrained like me (I have post it notes all over the place!) keep a pen and paper handy throughout the course of a week, and right down everything that you find you use for his care.
if i may suggest.. don't forget his pillow! :) my kids always sleep best away from home when they have a piece of home with them :)
If I were driving to VA (probably about a 12-15 hour drive) then I would go buy a portable DVD player, be sure to pack sandwiches and snacks for eating on the road (maybe a cooler would ensure food safety in the heat of June and July), and whatever creative things you can find to entertain him on the road.
good luck - have fun!! I was only in VA when I was drinking age,... we went to Virginia Beach and watched my cousins' boyfriend's Navy ship come into port after a 6 month cruise - so the experience I have in VA is definitely NOT for little ones :) oh... to be 21 again :)