I read an article Better than Bleach: Use Calcium Hypochlorite to Disinfect Water That explains how to use grannular pool shock to make supplies of chlorine to sanitize drinking water. It's PERFECT! especially for camping/hiking where carrying a gallon jug of anything but water would be highly impractical. I also have another solution which fits in your shirt pocket...it's a portable UV light bar used to kill all micro-organisms in fresh water for drinking. Before you do that, of course you can use coffee filters to get the 'Icky' particulates out of the water.