Originally Posted by TheDazed

I use a lifesaver bottle.
http://www.lifesaversystems.com/

It's a bit expensive, but I've drank lake ontario, lake huron, notoriously polluted rivers in Toronto here, as well as countless dubious water sources (swamps, muddy holes) straight from the bottle and haven't ever gotten sick from it. It reduces the stress of having and finding water on a bike tour for sure.