H2O Purification system to take to Haiti?

[jsmithy]

I have used the Katadyn Pocket Microfilter extensively in my camping experiences. It is the best I have used. The ceramic filter is easy to clean and filters down to 0.2 microns. Rubber band a coffee filter around the inlet housing to keep the big chunks out.

I would suggest boiling in addition to filtering if possible.

[Razorhunter]

This is an interesting topic, one which I've wanted to discuss for a while.
I, like many others on these forums, would like to know if there is a short list of "the best" water purification devices that have been tested and compared extensively?
I know there is a lot of new products out there these days, but I'm just looking for something that can be used to take ANY and ALL impurities out of water, to provide fresh clean drinking water, anywhere in the world.
Portable, affordable, and dependable are the prerequisites of course.

[ST911]

A twist on the thread...

If I was going to buy and maintain water filter systems for deployment/contingency kits, that is size efficient, to cover trips into CONUS backcountry, disaster areas CONUS and OCONUS, and overseas in general, which one does the job?