No magic potions. There are no magic potions one can use at home to prevent or treat raynaud's symptoms, but things that keep one warm are helpful. Examples include: a well insulated home with the heater set at a warm temperature, a circulating hot-water system in which the water is hot right away from any faucet, not touching cold things that come out of the fridge, drinking warm soup, using down comforters, etc..
Yes.. Key to management - avoid exposure to cold: wear warm socks and mittens. Use microwaveable or chemical packets for extended heat release. There are also battery operated electric heaters for hands and feet. Look in the skiing sites, they have lots of various options.
Yes. Avoid exposure to cold. When you have to go out in the cold wear warm gloves.