You can bring only a small single bucket, and to avoid them drowning in melting ice, use an ice-pack instead, keeps them plenty cold and calm. Add just a little water (very little) when you get there or chuck some seaweed in.
Don't use the same ice-pack for food later though.
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Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.
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