Isn't it feasible to "make your own bleach as needed"? Consider this product on Ebay:
"Power Shock 68% Calcium Hypochlorite Swimming "Pool Shock" ( 2 X 1 lb. Bags) for $12.98 on Ebay. [LOTS AND LOTS of offerings for related products in different sizes--or buy it on Amazon...or your local pool store @ retail.]
See discussion about usage for water treatment here:
http://www.emergencyhomepreparation.org/viewtopic.php?f=25&t=97
WARNING--LONG QUOTE:
"For granular calcium hypochlorite, 1oz = 50ml = 10.1 teaspoons
"To treat clear raw water with 65-70% calcium hypochlorite there are a couple of ways to do it. If you want to directly treat the water with calcium hypochlorite use the following:
"1 Gallon: add one grain, about the size of the period at the end of this sentence.
55 Gallons: add 1/8 teaspoon for a 5ppm solution.
400 Gallons: add 1 level teaspoon for a 5ppm solution.
"To make a 5% chlorine solution to be able to use the drop method for disinfecting water, add and dissolve add ½ teaspoon of 65-70% calcium hypochlorite to ¾ cup of water. This will decay at the same rate of purchased 5.25% bleach so don't make more than you will use in a fairly short time.
"Here is a detailed conversion chart for using calcium hypochlorite.
http://chppm-www.apgea.army.mil/documen ... ftTBMED577).pdf
"Remember, you want a residual, after treating, concentration of about 0.5 ppm so get "some pdp test material.
"Get a plastic ½ teaspoon and 1 pint - 1 qt plastic bottle and store with your calcium hypochlorite.
"1 pound of calcium chloride will treat about 65,000 gallons of water at an initial 5 ppm concentration.
"Calcium hypochlorite has the major benefit of extended shelf life. Providing it is kept dry, cool and in an airtight container, it may be stored up to 10 years with minimal degradation. If you want to keep chlorine in larger quantities or for a long time, this is the item to store." [END QUOTE]