I made a 250 mile trip with various fish in a bucket when I helped a friend move from Baltimore to Pittsburgh. We got a bucket with a lid, cut some slots for the airline and heater power cord. Ran both off a DC
converter and kept the lid on tight to prevent splashing water inside the car.
I added a couple drops of Prime before we left too. I kept the bucket on the floor in the passenger seat and kept the car heat aimed at the bucket (it was winter time). All of them made the trip just fine.