As far as I’m concern this is the best bang for my buck, the Katadyn Hiker Water Filter. Cheaper filters just are not near as good and More expensive ones seem to do the exact same job (unless they are also impregnated with silver). For all my camping, survival or bugout needs I rely on my Katadyn.
***Note: I am not sponsored by Katadyn and I receive no money or products for this enforcement. I just like it. ***