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Another option is to keep your water bottle inside your jacket and use your body heat to prevent the water from freezing. Many mountaineering jackets have internal elasticated mesh pockets for this purpose. Alternatively, I find I can just put the water bottle inside my jacket and use the waist belt of my rucksack to prevent the bottle from falling down ...

If you wash the canteen thoroughly before using it then it shouldn't affect the taste too much regardless of what material its made from - I'd recommend this anyway just as a matter of course. Wash once, soak overnight in hot, soapy water then wash again. Where this might come into play more is your lips physically touching the metal when you're drinking ...

For winter hiking, I prefer to wear a hydration bladder inside my coat and you can fill it with warm water if desired for an extra heat bonus when you start out. When camping in the very cold, you can often find / treat water and just heat up enough for a day or half day and carry that water closer to your body. Also, a bottle inside a spare fleece, ...

Personally I'd recommend soft plastic type water bottles if they'll be frozen (though still check that this is ok with the manufacturer.) I've heard some people recommend Nalgene bottles for this, but have heard stories from more than one other source about them splitting when left to completely freeze. A softer plastic will allow for a bit of expansion when ...

We've been using flexible Platypus reservoirs and have had no trouble thus far. I have knitted an insulation tube (six-stitch I-cord in a sport weight wool) that runs the entire length of the drinking tube-- that's where we've seen the most issues with freezing because of the enormous surface area of the tube. When the reservoir isn't in my pack, it's near ...