I'm planning to live in my car for several days while the cat sits at home.
Why would you leave your cat at home? Don't you love it?
The cat pees at the floor and I'm sick of that
You should take care of your pets and make sure they have a litter box they can use that is clean. If it really can't be trained, then you should re-home the cat instead of trying to torture it.
I don't want to clean the cat's box it's a hassle. It's better that I leave her alone.
It sounds like you are no longer willing to take care of this pet properly, so I suggest that you find another home for it, or give it to a shelter. Cats pee around the house when they don't have a clean litter box, so if you neglect this animal, the problem will only get worse for you.