The keys to survival, shelter, food, water, firearms and ammo. Iodine tablets could spare you from radiation sickness. Forget about life as it was pre blast. it will be every man for himself. Every day that relief aid fails to come, people will get more desperate. They will KILL for your food and water. Anarchy will prevail so it is imparitive that you stay put and not travel. Do not place yourself in a position where you may have to share your provisions with neighbors or friends.
As for any disaster drill, people should know by now that FEMA will not come running to save you. You will have to save yourself. And the best plan to save yourself is lay low, be prepared to shoot intruders dead, and protect your provisions.
The rest of what you wrote sounded reasonable to me, but the above quote seems wrong to me. Iodine tablets have a very localized affect - reducing the amount of radioactive iodine that gets to your thyroid gland, so reducing your chances of thyroid cancer years later. The other 99.99% of your body gets zilch, zip, zero, nada protection from the iodine. Your short term risks of radiation sickness or resulting death are unaffected by the iodine.