Hello and welcome to the forum!

If it's just an hour drive, I would just move them to a small plastic frog carrier, like a Kritter Keeper) with damp sphagnum moss before you leave. I wouldn't bother putting water in there for that time period because it's likely it'll just get sloshed around and spilled. It's generally safer to skip it especially if it's only going to be a couple of hours. Put them back in their home once it is set up. They should do just fine!