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Back in the day I used to go on a week long desert excursion every year. I would pack up a big ice chest with ice, add in a couple pounds of dry ice, and duct tape the whole thing shut. Five days into the week we would open it up, and the ice would be about 98% frozen still. The paper that wrapped the dry ice was empty, and the chest opened with a little pop when we removed the tape. You should be fine for a couple days.
Make sure you freeze everything before you put it in the ice chest.
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