On a road trip, puppy won’t go potty

Hi there, we are currently on a road trip from North Carolina to Florida and we stopped at a hotel overnight.. my 5 month old cavalier puppy just won’t go potty. He hasn’t been since yesterday since 7pm when we left… it’s 8am right now. He usually goes right away in the morning multiple times. He will go potty all over the house and my bed but now when he has a lot of grass available he won’t go.. everything is more interesting then his own needs. Yes he is acting absolutely normal, he even drank and ate some. No vomiting or different behavior except he is stubborn. I don’t know what to do. We have 8hr drive ahead of us and he is being silly. I’m frustrated