Regarding the general category of water purification, you have essentially combined reverse osmosis with UV disinfection PLUS the necessity for solar and/or gas generated power. Take away the essential electrical power and you still have to boil your water. If you do the math, you could invest up to $2500 for your version of water purification. That’s a “big ticket” indeed. Once again, there are abundant information sources that provide instruction for long term water purification that cost far less.
Why not take it a step further and think, if you were in a flood, earthquake, or some other disaster or SHTF scenario where supply routes were cut off, and clean drinking water was not available, how would you try to mimic normal life and keep your modern comforts, let alone survive without relying on running taps, full grocery aisles, and electricity.
Over the years, I’ve had many requests to create a book about a simple guide to being prepared. Readers wanted a preparedness formula they could share with their friends and family.  They also wanted a way to see how they measured up as a prepper.  Prepper Supplies Checklist is designed to meet that request.  It’s a quick 20-minute read workbook, but if you’ve got the prepper mentally, you may find yourself taking inventory of all the supplies in your home (in which case it is a little more of a time investment).  Don’t judge a book by its length.  This book is loaded with resources and information that will have you looking at your supplies in a new light and spark life into your preparedness efforts. Prepper Supplies Checklist is a workbook designed to help the user develop an emergency preparedness plan.  It is presented in an easy to read format that includes stories, photos, illustrations, helpful tips, and some great survival gear ideas!  Each section can help you evaluate the supplies you currently have available, the location of supplies, provide ideas on items you may potentially lack, and checklists to measure progress toward your preparedness goals.
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.
In 1980, John Pugsley published the book The Alpha Strategy. It was on The New York Times Best Seller list for nine weeks in 1981.[10][11] After 28 years in circulation, The Alpha Strategy remains popular with survivalists, and is considered a standard reference on stocking food and household supplies as a hedge against inflation and future shortages.[12][13]
To the extent that one exists, the public image of a prepper is of someone who's getting ready for the collapse of society, at which point money and electric grids, along with all the things that depend on them, will become unavailable. Preppers are ready to purify water to drink, hunt and butcher for meals, and scare off anyone who tries to get a piece of their post-apocalyptic bliss, possibly via gunfire. There may be bunkers involved.
The Cold War era civil defense programs promoted public atomic bomb shelters, personal fallout shelters, and training for children, such as the Duck and Cover films. The Church of Jesus Christ of Latter-day Saints (LDS Church) long directed its members to store a year's worth of food for themselves and their families in preparation for such possibilities;[2] but the current teaching advises only a three-month supply.[2]
Luther’s decision to build up a pantry, she says, did more than help the family get by on a tiny budget. Later on, it would also help her through a divorce, the sudden death of her ex-partner at age 40, and getting laid off from two jobs in the automotive industry in the late 2000s. “I feel that it’s the whole reason my my mortgage didn’t go into default when I was unemployed, because I didn’t have to go to the grocery store and buy stuff,” Luther says of her experiences during the recession. “All the limited amount of money I had could go to paying the mortgage and keeping a roof over our head.”
Since people began building fallout shelters during the Cold War, canned nonperishable food has been recognized as great to have around when the going gets tough. Freeze-dried food and MRE (Meal, Ready-to-Eat) military rations with years of shelf life are also good options that take up less space per available calorie. [Doomsday Facts (and Fictions)]
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For the Soon to Be Ready for Anything Prepper

The Ultimate List of the 8 Most Important Surviving Skills that will Make the Difference between Life and Death during a Crisis