Let me make another suggestion: bring along an abundance of patience and goodwill.

It's unlikely that being stranded in an airport will be life-threatening no matter how long, but we'd be surrounded by ill-tempered people in great stress. My suggestion is not to become one of them. Somewhere in the building there are some calmer people sitting around waiting for it all to conclude so they can get on with their travels. Find those people and join them. Do favors such as watching bags while people take bathroom breaks or go for food, share what you can, be of good cheer.

Remind each other that although it does suck right now, it will end and it will be a great war story next year.* Being calm and supportive is a great gift to share.