In addition to the tunnel crawlers, we may soon have to face nuclear attack, and by the prophesies, it seems it will happen. Nuclear fall-out is when the nuclear blast picks up small particles in the air, and drops them down. This will happen over a massive area within an hour, so there is no time to get prepared. As such, everyone should have an entire survival kit for one month MINIMUM in their bomb-shelters. Also, Israel no longer holds any grain in reserve, which is a crisis in itself. Everyone should try to build their own silos underground which may be accessed by the bomb shelter, and since grain goes bad every three years, keep rotating the grain so that your supply is always full and you eat the oldest grain first.
It goes without saying that weapons are crucial, and since they're illegal now, you can still buy entire kits and parts and ammo, and store it with working tools in a shelter. This ensures no one can use your guns or prosecute you for them, but you will have access to them in time of crisis.
Despite the high prices of water, it's the most critical investment. Nuclear fall-out will poison all the water systems, and even the deepest sprigs may be fed from a contaminated source. Look no further than the nuclear radiation all over the pacific from the melt-down in Japan for proof. There's no possibility of filtering it through rocks and sand either, because first off it's much too small, and second off you'll also contaminate the rocks and sand. Boiling also will not help, since the particles don't stay at the bottom. Cleaning nuclear radiation requires advanced and extremely expensive equipment. As such, it's a great idea to store as much bottled water as possible, and to keep a salt water pool with fish you can grow with access to the bomb shelter or cellar, and you can eat all the fish and use the water for your excrement, as leaving it in a small room may cause you to die, and I can name many possible causes.
Empty calories and such will be of no use. Keep bottles of lemon (lime is even better) juice, for vitamin C, or you will suffer and die an agonizing death from scurvy. Maple syrup is also OK, and doesn't really go bad. Canned fish is the best way to have protein, so tuna, sardines, salmon, anything in a can, stock up, beans too, but make sure to change the water several times while cooking (it's a small space), and obviously a gas stove is a critical part of any survival kit, not to mention for boiling urine or dirty water, if there's no other choice (if you drink your urine 3 times in a row, you will die, though).
Seems silly, but the worst enemy will be boredom, because you will be induced to go outside and see if it's over yet, which may cost your life. Keep plenty of reading materials and games if you're several people, nothing electronic unless you spend huge sums of money protecting the wiring.
Your shelter must be air-tight, but obviously you need air, and opening the door to a gushing wave of nuclear fall-out will defeat the whole purpose. HEPA filters, and even the most expensive, won't cut it. You will need special micron filters, which are very well described here
http://www.ki4u.com/webpal/d_resources/survival/shelterair.htm, but your filter leads to must also be safe from explosions, or again the purpose is defeated, and must have access to air, meaning not at risk to be buried. Running the air ducts through a home or structure that might collapse is a bad idea, and having the ducts visible is also a bad idea, because it can be followed to your shelter, and letting people in or people breaking in means you die like them. These are problems especially for those that have a bomb-shelter or cellar in their house. The air ducts should lead a considerable distance away, and be hidden under plants (that have no risk of clogging it!!) or disguised to look like something no one would notice or touch, or camouflaged if nothing else.
Toilet paper, and this is something you really want to prepare for, will run out, and you won't have the water to waste on doing it India style. That's what I'm working on. What would we do for toilet paper? You do not want an infection down there.
That brings me to anti-biotics. Very important, and not just little ones for tooth aches. Stock up, seriously. Showering at least once a week is extremely important as well. You will need cloths, soap, and a cup of water to shower with. Wipe yourself with the cloth. Limit sexual activity as well, or you will need to do it more frequently, which costs water.
Anyone have anything else to suggest the coming nuclear war? Israel might just get out, but we know 2/3 of the world is prophesied to die, so the rest of the world, Europe and population centers of America in particular.