Provided there is room, why would anyone object to additional resources being brought aboard? Bear in mind that lifeboats are required to stock food, water, solar stills, etc. for their anticipated capacity.

Perhaps it would be worthwhile to inquire of the cruise company as to the equipment that is carried aboard their lifeboats. This would be of great help in deciding what you might bring aboard. A fine Merlot or Chablis would be wonderful after a few days of nothing but bread and water.