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If you are using dry ice, watch out for the CO2 that is released as a gas. Your ice box probably drains to your bilge and the CO2 will will drain there as well (heavier than air) and has the potential to force ALL of the oxygen out of your cabin thus incapacitating you or at worst killing you.
I would just use block ice. You should get a decent amount of time out of it. You could also use the UHT pasteurized milk that can live on the shelf until opened. Freeze some of your meat solid and then thaw on the way. It would also keep your other contents cold.
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