I've used bleach carried in a empty eye dropper bottle (be sure to mark the bottle!) on camping/canoe trips for years and never had any probelms... I carry two 1 quart bottles drink from one and fill and treat the other... four drops per fill and then it needs to stand about an hour before your drink it.<br>One other tip, if you don't like the taste, a trick I use is to dump the glass of water your about to drink from one cup to another a couple times to help release the clorine... actually works quite well. You do get used to the taste and smell very quickly right from the bottle though.