I drove 24 hours with Aspen when she was about 6 months old. She slept most of the time. I let her out to go to the bathroom when we stopped for gas. I filled a couple of Kongs for her. I offered her water every gas stop because it was such a long drive. When we go camping, it's usually about 4 hours away and I don't bring anything for her. She sleeps and she can go to the bathroom and drink when we get there. It's not a long drive and she goes longer than that in the house haha