Vestergaard-Frandsen is a company which made a an instrument that filters out water. This instrument is called Life straw. It is designed to put it directly into the water and drink the water out of it. There's no need to boil the water to get rid of an toxins because there is a pre-filter which has holes small enough to filter out almost everything, the holes are 100 microns in diameter. What ever is not filtered out, gets filtered through the polyester filter which has even smaller holes than the pre-filter, these holes are 15 microns in diameter. The water is then impregnated with iodine to kill an parasites. The last chamber the water passes through has granulated carbon to improve the taste and smell of water.
http://s3files.core77.com/blog/images/0exp-lifestraw-diagram.jpg
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