First, I've done this a few times and we re-provision perishables once there (up to 5hrs so far). I hear the frig is good if cold and not opened for close to 6hrs. Beyond that, I'd be adding ice blocks (warm beer is a European thing).
Think of your frig as an upright cooler and work accordingly. Ice blocks in zip-lock bags (near the beer) and work your produce according to how it want it stay cold. Like I say, an upright cooler. Dry ice to me is a over-kill and not really needed. I did that on a 6 day canoe adventure that I packed some steaks in a small cooler with dry ice. Night five they were still frozen.. Over-kill for a passage.
Don't over think it, yet think it. Ice blocks will do you fine. Packed around the beer, LOL..