Fresh Crawfish.....

As long as you replace the ice as needed, you can store crawfish on ice for several days without killing them–but keep in mind that the fresher they are, the better the flavor will be. If you plan on storing them for more than two days, rotate the sack daily to keep them at peak condition.

The easiest way to purchase crawfish is frozen. Frozen crawfish have been cooked and peeled, and the tails removed and frozen. They will keep this way in your freezer for up to three months. If you cook and peel the crawfish yourself, place them into heavy duty freezer bags, about 3/4 full.