I strongly disagree with several of the conclusions in this book, such as focusing almost completely on getting to stay in your home, the attitude of 'don't bother worrying about storing food for more than a couple months', etc. I'm just not happy about payin for a book that basically gives me someone's opinions along with incorrect data (veg oils do NOT last longer than other types, for one) and tells me what other books to buy.
Thomas spoke about these in his article on purifying contaminated water. Basically, the reverse osmosis water purification systems, like the one featured as #5, will take care of larger contaminents. Couple that with ultraviolet disinfection and the rest of water purification is pretty well taken care of without requiring anything too expensive. Remember that this system requires electrical power, so you’re going to need to take that into consideration. But with a solar panel generator, it’ll do the trick perfectly.
And what better place to prepare than the Ozarks? Strafford got 47 inches of rain last year; the mean temperature was a mild 59 degrees. The Springfield Plateau has a 200-foot-deep aquifer for when rainwater gets scarce. The region is largely insulated from natural disasters—save the odd tornado or benign rumbling from the Bootheel’s New Madrid Fault Line—and the low population density of like-minded folks means preppers, survivalists and homesteaders get left alone. A Lebanon real estate agent tells me remote acreage is an increasingly hot commodity for city dwellers eager to go native. Conversations with locals and time spent on survivalism forums reveal a religious cohort who believe the Ozarks are God’s country—sacred ground upon which one can wage a last stand against the sins of a rapidly globalizing world.
In the next decade Howard Ruff warned about socio-economic collapse in his 1974 book Famine and Survival in America. Ruff's book was published during a period of rampant inflation in the wake of the 1973 oil crisis. Most of the elements of survivalism can be found there, including advice on food storage. The book championed the claim that precious metals, such as gold and silver, have an intrinsic worth that makes them more usable in the event of a socioeconomic collapse than fiat currency. Ruff later published milder variations of the same themes, such as How to Prosper During the Coming Bad Years, a best-seller in 1979.

Dozens of websites and books offer advice on supplies to have on hand and in stock if "the end of the world as we know it" – TEOTWAWKI, as it's known in survivalist circles – comes to pass. Here, then, is a rundown of the supplies you'll need to ensure that this proverbial "end of days" is not an end for you and yours, but rather a new beginning. [Could Cockroaches Really Survive a Nuclear Blast?]