Definitely put some fleece or a blanket inside the carrier and an unwashed t shirt would be a great idea so that they get used to your smell. You could add some water, but if it’s only an hour and a half drive he’ll pribably be sleeping the entire time 🙂 congratulations! You’re going to love him. And don’t hesitate to ask questions on here, especially since this is your first hog!
As far as heating, just keep the heat on as high as you can tolerate it. It’s not gonna be too hot for him but it could definitely become too cold.