First thing's first, safety is more important than getting your caffeine fix, make sure you have your hurricane supplies stocked and ready to go first! For more information on that, you can visit this website for a guide.
NOW, ON TO THE COFFEE
There's actually a nice little benefit to making cold brew coffee ahead of time! The acidity of the coffee will dilute while it's steeping, leaving you with a smoother, more sweet tasting brew! Plus, you get a little extra caffeine. Not only is this a good way to go during prep for a power outage, but this is also great for those hot summer days when a piping hot cup of coffee just makes you feel sweaty and uncomfortable!