These are portable and personal filters:
Certainly, if time is of the essence and money is not an object, there are other sites like:
http://www.backcountry.com/water-filters Not a bad place to go, all products currently available, easy to navigate site, you can pick your price range in the search feature.
http://www.moosejaw.com/moosejaw/shop/search_Water-Filtration Also an easy affordable site with other brands like Camelbak and more.
But, there is nothing stopping any of us from going direct to the maker at www.katadyn.com
Of the above sites, I think you will find the most, possibly the best, personal portable filters at MSR. Msr sells tents, cookware, stoves, tents and gear for the cold weather hiker at http://cascadedesigns.com. Should you think you will ever need to travel after the stuff hits the fan, this site is somewhere to go to look now.
Ceramic Water Filters:
MiniWorks Portable Ceramic Filtration System
The Best of the Best in Portable Water Filtration Systems. This unit is for the next time the power goes out in Cleveland or Detroit and the water from the tap is undrinkable. Or when the next earthquake, tsunami or hurricane hits. Don't wait for an "American Haiti" disaster before you invest in a life-saving tool such as this item. Truly a small investment in preparation for a time of need.
Bacteria Removing Ceramic Element for WaterWorks II and MiniWorks Handheld Filters
http://doultonusa.com. Offering cutaway views of their product on the home page to show you what they make from the inside out!