Respectfully, Mick, I disagree. Giardia or cryptosporidia won't kill you - thirst/dehydration will. Without a container of some sort, you have no way to use your purification tablets (or your desalination kit, either); without purification tablets, you still have a way to carry water.<br><br>I'm probably being pedantic, but I don't see any argument that purification tablets are more important than a water container. Some of our ancestors lived relatively long lives drinking unpurified water. Granted, others subsisted mostly on cheap wine, and yeah, there was a lot less pollution in those days; but in general, they had a lot more sense than the people you occasionally read about who die of thirst because they refuse to drink muddy water.
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"The mind is not a vessel to be filled but a fire to be kindled."
-Plutarch