5 days is fantastic.
We thought about getting one of those 12 volt coolers a couple years back. Can't remember why we decided against it.
Thermoelectric coolers, or Peltier coolers, are extremely inefficient. Most of them tell you to pre-cool anything you want to put in them and then will only keep stuff 35-40°f cooler than ambient. I looked in to them for car-camping with the family and ended up going with an old Norcold ac/dc refrigerator.
When motorcycle camping I've forgone everyrhing that needs to be cold. Water sources are never an issue in the Cascades so I took a Sawyer Squeeze filter. A lot of Mountain House and Packit Gourmet dehydrated meals. My favorite quick, high calorie meal is Idohoan instant mashed potatoes with Spam cut in to chunks and fried in butter.
I use a Trangia 27 series alcohol cooker. It has a kettle, 2 bowls, and a frying pan.