buy some dry ice from your meat department, wrap it in butcher paper - several layers. You don't need much and it should last a good five days, It works so well you run the risk of freezing stuff in your cooler. When car camping, we take uncooked, frozen meats all the time, especially when we have dry ice. Eggs also last forever as long as they are kept cool. If you have an India Food store (or a whole foods) go shopping. We buy "all in one" meals from our India Food store that are terrific. They are boil in the bag so no mess. They also have boil in the bag rice. They are extremely tastee and way less expensive than the ding dang freeze dried crap - oh I mean food India Food is our go to for bike touring, great energy, easy to fix, healthy ingredients.
Sounds like it will be a fun trip