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This is a partial tip. Water has a much higher thermal mass than air does. It takes much longer cool a bunch of water down than it takes to cool the equivalent volume of air to the same temperature, it also stays cold longer.

You don't generally want to pull stuff out of your freezer to make room for water but it's a great idea to fill up empty space with water. That will make your freezer more efficient even when there's no hurricane.

Having drinking water on hand is a good tip too but you don't need it in the freezer. There are lots of instructions on how to safely store much more water than can reasonably fit in your freezer.