We always travel with our cat. She is old and gets very stressed when left alone even for a whole day. To be honest, I worried before our first trip, but if the most important things are taken into account beforehand, everything will be fine. So, I bought a water fountain and an automatic feeder for her. I should say, it eased the process and I didn't think about that being on the road. But one of the best ideas was to get a GPS tracker (I found a good list here
https://www.catfoodpoint.com/best-cat-gps-tracker/). Usually, our cat doesn't go far from us, but still, she is a cat, everything is possible. And with a GPS tracker, I can always view her exact location.