[at-l] Another cold weather question

Now that I've gotten my ''icy walking" question answered (and thanks to 
everyone for the great input), I now have some questions regarding hydration 
in sub-freezing temps.  I took a great day hike yesterday, it was like 
paradise to me. Hiked NB from the MA 23 parking area to Mt Wilcox North 
shelter and back. Wasn't any snow to speak of where I parked, but by a couple 
miles in there was anywhere from 2 - 4 inches which fell on Thursday. I was 
loving it in a big way.  I also realized hiking solo is not hiking alone, I 
was in good company, the woods embraced me.
    Okay, I'll get to teh questions. I carried a qt Nalgene bottle, and by 
the time it was 1/2 gone I was breaking up ice in it to drink, I had 
remembered someone's recent post suggesting to carry the water bottles 
upsidedown, this was a good thing to know. All ponds I passed were completely 
iced over, but there were numerous flowing streams. I was wondering if 
filters will function properly under these conditions, or do you run the risk 
of any water left in the filter freezing, thereby diminishing the filter's 
effectiveness, or damaging the filter. Also, if I had opted for my water 
bladder, it seems I would have had trouble keeping the drinking tube free 
from ice, is this correct? I know that when spending the night in these 
conditions you should sleep with your water to keep it from becoming a block 
of ice, but how do you keep a fresh supply available while hiking ?  Even if 
you don't feel really thirsty it is really important to stay well hydrated in 
cold temps as well as warm.
                        Thanks,   Tina
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