Im sorry but have you read the directions on Clorox? it specifically states it can be used to disinfect drinking water go check it out. Im still waiting for proof that small amounts of bleach harm plants in any way. I'm not saying everyone should use it but I do question the reasoning behind not using it for emergencies.
Straight off the Clorox website and I believe this is stated on the back of the bottle as well;
When boiling off water for 1 minute is not possible in an emergency situation, disinfect water by:
1. Remove suspended particles by filtering or letting particles settle to the bottom. Pour clear water into a clean container.
2. Add 8 drops of Clorox[SUP]®[/SUP] Regular-Bleach to one gallon of water (2 drops to 1 quart). For cloudy water, use 16 drops per gallon of water (4 drops to 1 quart).
3. Let treated water to stand for 30 minutes. Water should have a slight bleach odor. If not, repeat and wait another 15 minutes. The treated water can then be made palatable by pouring it between clean containers several times.
http://www.clorox.com/products/clorox-regular-bleach/how-to/