Final answer:
During winter, for protection and safety, one should carry drinking water, extra clothes, and blankets in the car to stay hydrated, insulated, and retain body heat.
Step-by-step explanation:
For protection and safety when traveling during the winter months, especially considering conditions can be exceptionally cold, it's important to have certain items in your car. These include drinking water, extra clothes, and blankets. Each of these serves a vital function: water for hydration, extra clothes for insulation, and blankets for retaining body heat. In the scenario of being stuck in a blizzard, the body conserves heat by becoming lethargic, not by increasing blood flow to the extremities. Therefore, having these items can be crucial for survival.