If a nuclear missile is launched at Hawaii, I believe we'll only have 10 minutes or so to prepare.  So, sure, stock up on non-perishable foods and water now, which is a smart thing to do regardless out here in the middle of the ocean, a big ocean, surrounded by water, lots and lots of water.  But really.  A nuclear tipped missile?  If I'm home I'm going to pour myself a glass of Scotch and turn on some music.