Take whatever tools make you feel comfortable, especially so you can change a tire, top off fluids, and maybe fix leaking hoses or clamps. On a modern car that new, a flat tire is the only problem that's very likely.
I agree with the many suggestions for taking a few gallons of drinking water and some emergency food. Otherwise, stay alert and enjoy the drive.
I bought a slant-six Duster when it was 20 years old and then did trips like this for the next 7 years. That thing had a huge trunk, so I carried all of my tools, various fluids, and spare parts. It also had no A/C, so I drank a lot of fluids on long summer trips.
I only had one problem aside from a flat tire. It was running badly coming off the Ozarks, so I put on my spare carburetor at a convenience store in Talequah, Oklahoma. That didn't fix it, so I had to call a shop. Instead of charging me for a tow, the old-timer who showed up got me to limp along behind him. He threw in a set of points and I was off again. I changed points every 10,000 miles and carried a spare set from then on. On second thought, I did change a water pump in a motel parking lot. That might have made it another day or so with topoffs, but I had the time and space to fix it.