But in winter the cold conditions make it harder to respond to thirst. When you fill your water bottle in the morning and again in the afternoon, fill it with warm water. You will drink more and feel warmer if your water is well above freezing. Carry a half-liter vacuum bottle in your daypack on the coldest days. This will keep soup or sports drinks hot all day and make a windblown lift ride much warmer.
Tomato soup is a cold weather favorite.
Use one of the tube-fed hydration systems. Many small sips are much better than a few big gulps and hydration systems are the right tool for the job but in very cold weather you run the risk of freezing the drink tube. Make sure you have warm water in the reservoir, an insulating sleeve for the tube and valve, and remember to blow the liquid back into the reservoir to clear the tube after each sip. In addition to carrying water, make sure to drink an additional quantity at lunch. Hold off on the caffeine and alcohol they are diuretics and will flush water out of your system.