1 tablespoon of bleach per gallon seemed like ALOT of bleach to me. I found this on the net:

HOW DO I PURIFY WATER?
If your stored emergency water is destroyed in the disaster, you may need to know how to purify water. Water, whether cloudy or clear, that has been exposed to the air for a few days should be boiled vigoriously for 10 minutes to kill bacteria. Also water purification tablets are available at many drug and camping supply stores; follow directions on the label.

Some kinds of "Liquid Chlorine Bleach" can be used. Check the label; it should contain 5.25% hypochlorite to be effective in killing bacteria. Add to water using an eye dropper in the amount indicated below. Stir. Wait 30 minutes before drinking.

Amount of Water 1 gal/5 gal
Amount of Bleach clear water 8drops/16drops
Amount of Bleach Cloudy water .5tsp/ 1tsp

For additional information call the EPA - Safe Water Hotline (800) 426-4791.

Source: Environmental Protection Agency and U.S. Department of Health and Human Services
Stock No. 202-717, LA form 974

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