You could try chlorine ...

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You could try chlorine dioxide tablets. There are a number of businesses that manufacture them. We have experimented with them but don't like the sediment they leave behind over time. Google up Tristel or Scotmas or Dutrion. Chlorine dioxide will kill virus, E coli, spore formers and crypto and giardia. I manufacture a chlorine dioxide solution 1000ppm and have had it lab tested with a 0.006mg/l of chlorine showing which the laboratory people reckon came from the town water supply. This product has a shelf life of at least 6 months if stored correctly!