Mountain Safety Research has miniaturized a water treatment plant that creates MIOX, mixed oxidants, that give a 100% purity to water with the click of a switch on a tiny flashlight-sized gizmo. Silver Colloid works as a catalyst to oxidation, and this is the same genre of purification. You add salt to the cap, click the strength of the solution created--unlimited--and add to the water you wish purified. Check out the stats on even the best filters and nothing can compare to this 100% purity for unlimited amounts of water.
Four hours is the outside time it takes to kill the most tenacious bug, Cryptosporidium. Just let batches sit overnight. Run your own water treatment plant by first straining through fabric or a 'yarn' filter to remove turbidity and cloudiness, hit it with MIOX to kill all bugs, wait four hours and polish with carbon filtering impregnated with silver (to kill bugs in filter medium) to remove any toxic solvents. Ta-da! What a lifesaver whether traveling or in the aftermath of a disaster and no Iodine or chlorine.