Berkey water filters are a scam, despite what your favorite prepper or truther Youtuber is trying to sell you. This filter is a fraction of the price, and the system itself is simple and cheap.
If you are serious about preparing for the worst, a good friend to have is colloidal silver. It sounds like a very technical thing, but it is really just tiny silver atoms trapped in water. Making it and testing your success is painfully simple, and besides the silver, does not require expensive components. Well yea there is is the silver of course, but you don’t ne