Today would be an excellent time to take a few minutes to ensure the extreme cold weather in the next few days will not cause you major headaches.
Things to check right away.
Most have wells. Check to make sure where your pressure tank is located will have some heat. If its in a crawl space, is it cold down there and will it get colder. Do you need to get your heat tapes replaced etc. Alittle preventive maintanence now, save alot later.