The Katadyn Hiker Pro is my go-to water filter. It is easy to use and lightweight, as filters go. Get as much water out of it as possible and keep it in your sleeping bag in sub-freezing conditions. I love that the storage bag has a separate container for the output hose to keep it clean. Practice with it at home to get used to handling the intake hose and keeping the output hose out of contaminated water.
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