[Kartographer]

Better than Bleach: Use Calcium Hypochlorite to Disinfect Water

http://survivaltopics.com/better-than-bleach-use-calcium-hypochlorite-to-disinfect-water/

There are also several excellent water filter systems Katadyn, Berkey and I have heard good things about Sawyer especially price wise.

I have a small portable Katadyn as well as a Berkey filters which I installed in a DIY bucket filter system.

http://www.survivalistdaily.com/how-to-make-a-berkey-water-filter/

[MrB]

I bought trichlor for that purpose.
Of course, there’s some additional dilution steps necessary,

but I have enough for 30,000 gallons.