http://www.healthcentral.com/migraine/cf/slideshows/building-your-migraine-attack-pack?%3Fap=419

There are some good idea in here, and some that I find baffling, but to each their own. I highly recommend having more than water on hand, as a great many people respond to caffeine. Also, keep some quality snacks on hand because many of us become ravenous just prior to or immediately after an attack.