Okay, so I have no idea whether you can tow a ship that large with the parachutes they deployed, but I rather doubt it would have made a significant difference. I also don't think it would have turned the propellers and spun up the alternators to produce significant power. I don't understand why they had no generator capability whatsoever to power a little refrigerator for the samples. Not even a portable. Letting the samples actually sink to and rest on the ocean floor sounded enormously risky. What is the crew capacity of a destroyer? 3000 gallons of water, properly rationed, sounded to me like it would have been enough to last the number of people that I see in the show.