One of my favorite things to do during the Fall and Winter is to go on a long hike — the barren trees and snow-capped mountains provide an absolutely gorgeous backdrop. But one thing I can do without is the water in my water bottle freezing, which can happen a lot during an overnight camping trip. It's important to stay hydrated during a hike, and frozen water will only add dead weight to your carrying load.
A simple tip I use to prevent my water from freezing is to insulate my bottle using recycled wool. I use an old wool sock that is missing its better half and slip that over my Nalgene water bottle. The wool helps keep the bottle insulated and the water from freezing. I also keep my water bottle close to my body to keep it warm with body heat. Filling a water bottle with warm water rather than cold is helpful too.
If you want something cuter than an old wool sock over your bottle, try making a cute water bottle cozy out of an old wool sweater. Or if you're feeling lazy, buy a handmade cozy instead, which, by the way, could make a great gift for the extreme sport enthusiast in your life.
Source: Flickr User SesameSeedDesigns