Okay guys, gals n' fellow misfits!
One of the keys to survival believe it or not is gonna be such a simple little thing like..... <bingo> water! Those who have it will live, those who don't may not. Does everyone have a stock of iodine purification tablets laid in for drinking water? Do you know how to distill potable water from seawater?
I highly recommend the recent copy of BackWoodsMan magazine. Not only do they have great tips and tricks, but they also show you a home-made collapsible water distiller that will turn sea-water into drinkable water without any boiling (you may not have or want to start a fire).
Besides, it's great reading in a lot of other aspects too. Enjoy!