Hi CT,
We did this trip with a 9 month old and also with a 22 month old (same baby boy, two different times). We decided to withhold TV watching until after he turned 2 so we didn't use a DVD and purposely bought our van without one!
Some ideas: plan a picnic lunch or snack in FL where it might still be warm...we found the I-95 picnic areas to be very adequate and allow for some running, jumping, etc.
Toys: books of all types, you might even visit the library to get some different ones, most libraries allow check out for 2-3 weeks. A Fisher Price doodle pro (this is what it looks like: http://www.fisher-price.com/fp.aspx?st=10&e=creativek...) I know that it says for 2+ but my son got his before he was 1 and loves it still! Some Fisher price little people or other smaller toys...Crayola flashcards. I know, sounds like something he is too young for, but they have animal ones and color ones, and it is something to hold and look at...again, my son got at one and we are on our second set of them!
Create a present bag...with small gifts. I often use the free toys from McDonalds, Wendys, Chick fil A and wrap them up. When it is tough to get back into the car or you cross a state line, offer a present as a reward.
Plan to stop every couple of hours and really run, stretch, etc.
Fun food...raisins in yogurt, animal crackers (in your own carry box), cracker packages, actually any of that 100 calorie stuff is good. Not too much sugar, no need to create additional energy.
Play games. Can you find a truck, can you find a van, etc.
We've done the trip a 3rd time last week and have never used TV and tend to enjoy them. Our son does great! We just bought a mini-van for this most recent trip (well, we needed a new car, just ended up that we bought it in time to do the trip last week) and it was easier having the extra room. Oh, one other tip, have someone ride in the backseat with the baby. We've always done that, one adult drives and the other is on baby duty. Makes it much easier when things fall, baby needs something, need to see if a diaper needs changing, etc.
Bring any loveys, blankies, etc. I alwasy pack an extra bag that is just toys so I can easily find it.
Good luck! Really, this can be fun!
CJS