I've used an eye dropper bottle full of chlorine bleach for water treatment during canoe trips for a few years... easy to carry, cheap, and works well with my two bottle fanny pack (allows one bottle to "rest" while I drink from the other)<br>Now they have the new filtered water bottles with built in treatment filters... but I'm questioning if they are worth the big bucks...<br>Any opinions? Is the chlorine bleach treatment enough?