I realized I may have jumped the gun by diving into finding the right reservoir before going over basic hydration tips. Staying hydrated (no matter how you actually take in the liquid) is one of the most important ways to make sure you enjoy yourself outdoors.
You may be wondering, "It's 5 degrees in Denver right now, so I don't think I'll be breaking a sweat any time soon. Do I really need to worry about staying hydrated during a polar vortex?"
The answer is a resounding yes. Colorado is dry, and gets even drier in the winter. Even if you don't live in Colorado, your body uses up a lot of water to heat up the freezing cold air that you breathe in all winter long, making hydration a year round priority.