I always caution folks about using Clorox because of the additives they often use in SOME of their Clorox products. You certainly don't want any of the additives in your drinking water.

I've read that some folks look for sodium hypochlorite. It's available at any pool supply shop at around $8/gallon and doesn't have any of the softeners and smell good stuff that Clorox might have in it, depending preference you buy.