When I moved with my three last July it was supposed to be a 24 hour trip....turned into 48 hours
I had a big carrier like that for Zoee too. The other two were small enough to fit in a cat size carrier
I did not feed them breakfast. I don't remember exactly what time I took the food away (I was free feeding dry at the time). I did allow them water either. Once again I am not sure when I took it away, but I don't think it was 12 hours before.
I put fleece in the bottom of all their carriers so they were nice and soft. It slid around a little though. I didn't cover the carriers.
I brought a litter box, which I kept in the trunk and water. When I moved it was 3 cats, a puppy and a turtle
We stopped every few hours for the puppy to go to the bathroom. When we did this I put my turtle in water in a container in the trunk. Took all the carriers out of the back seat. Then one at a time I took the cats out of the carriers and put them in the backseat with the litter box. I sat with them for a few minutes back there, then placed them back in the carrier and offered them water. I did this with each kitty.
None of them would drink ANY water the whole time. They each went pee once and it may be the begging and pleading I was doing that made them go
Does Oliver have a collar and tags? I put mine on a leash or did not let them out of the carrier unless all the doors were closed, so I did not have to worry about escapees!