Road trip! With Kitteh! How nice of you to take your cat on vacation.
Last summer, I did this with my old lady cat. She rose to the occasion and became a great Truck Cat. I have always wanted one of these. Granted, I told her that she’d have 3,200 miles to work her objections the h@ll out. It took her a day. Oh, and she really liked the clean sheets found each night at hotels. Sometimes she was contraban, but a cat likes a freshly made bed.
Anywho, put cat in the crate. Drive for a while. Tell her up front to just Man Up because no amount of meowing will make it stop. When you do stop for gas, coffee or whatever, let her out into the rest of the car with food water and a liter box.
Especially for a one-day trip (where the cat will only have the chance to endure and not learn as she would over several days of the same), it’s as you would do for horses. A still car lets her relax enough to decide if she’s thirsty, hungry or wants a potty break. So take time to have lunch in a restaurant so that she gets a break, too.
My favorite way to do a litter box in the car is to put it in a banana box you’d get from a grocery store. The shape is perfect and the sides are high so that litter (or pine shavings, my favorite) aren’t tracked everywhere.
Don’t be worried if she doesn’t eat or drink a lot. She’ll figure out how to take care of herself.
If part way through she is quiet and you feel comfortable, let her out of the crate. Most cats don’t decide to walk on the dashboard. If they do, you can throw them off. Cats are soft and flexible and cars aren’t that big. Just grab whatever part of the cat is handy. They can take it. It’s nice to be driving along with a diet coke in the drink holder and a cat as an armrest.
Oh, and mine would “wake up” each night around 9 pm or when we got off the freeway and start asking if we were there yet. She didn’t think that a driving day should extend beyond 10 hours. The cat is civilized.