We've had raw meat in the cooler and did okay. Put it as close to your ice packs as possible, same with milk or any other super perishable items. Veggies and fruit can be a bit further away from the ice, as you probably wouldn't want them to get frost bite.

Use the raw meat earlier in the week, and then you can probably get by on beans, cheese and pre-boiled eggs (and other pre-cooked meats) for the latter half of the week.