There is a Super Target that we've stopped at a couple of times on the way.
The driver knows where they can stop easily, but you can call ahead to make sure. Once they did Gooding's - I only needed water and a couple of snacks so that was okay, but wouldn't shop there again! I like Super Target, since they have everything you need and it's cheap for snacks and water.
There are also Publix stores on the way, so look at a Google map and see what you want, then tell them.