Gunk can and a pump for emergencies. My old cls55 was always NRF with no spare and came from the factory with can of sealant and a pump. In 6 years had 4 flats . all but one due to cracked soft as butter AMG inside rims.
On the tyre front I would take whatever the latest NRF Goodyears you can get. I have found them to be the quietest and most comfortable tyre, with good mileage as you say and no noticeable difference in handling over Contis, Pirrelis and Michelin. Just my opinion having tried them all across w211, w219 and w218 platforms