How do you sterilize the mouth of the bottle?
I'm picturing dipping your Nalgene bottle into the stream then using the pen to disinfect the contents of the bottle. What about the threads and the outside?
Its a matter of volume. The tiny amount of water you're talking about doesn't matter much - unless you've just dipped it in sewage. After all, how many of us have gone swimming in a lake and not worried about clamping our mouths shut the whole time?
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