Have fun
Ｉcamp without a coolbox for solo backpacking. Seems perfectly possible for a family camp, long life or powdered milk, buy meat / cheese just before you cook it and rely on tins and packets.
We've just done several days at a festival and the coolbox was pretty much used for beer We cooked a fair bit also, lots of things like pouches of meatballs in tomato sauce mixed into packet rice. Wth tins of sweetcorn and carrots added. Puddings of those long life single portions of Dole fruit, jelly, rice pudding, custard. By the end of it I was gagging for some fresh food! But it was fine.
Is there any reason you're not taking a coolbox? Space, don't want to pay out? Those supermarket resuable cooler bags are useful. Not the proper soft cool bag ones but the ones that look like a shopping bag. They'll keep some food fresher a little longer, even if it's for keeping fruit or bread at a more even temp.