we eat basic when were camping because were camping, i do a mixture of what everyone else has said, we buy the meat a few days early and freeze it, next trip i will get the butchers to cryovac our meat, i might buy 1 or 2kgs of sausages for example but divide it up and only put 3 in a snap lock bag(they are liquid tight) because that's how many we would need for one nights meal, I've also made stuff like tuna mornay and spag.bol.mince before we left and frozen them(but freeze them in 2 small batches rather then one big one(for example) and get them out at breakfast they take a bit to thaw out), we also use a lot of nonperishable foods such as instant mash, can veggies, the continental pasta and sauce packs(these come on special regularly "buy 4 for so much"), last trip l started doing the note pad thing, fruit cups instead of fresh fruit, this way we don't have to worry about fresh fruit or veg. getting knocked about because kids don't touch bruised fruit and we don't have to worry about the fresh stuff freezing in our fridge freezer, we keep drinks in a separate ice box so the kids aren't opening and closing the fridge full of food all day especially in the warmer part of the year, i do like the wrapping in foil idea
cheers Mel