To those getting below freezing temps for an extended period of time where you're not used to it, if you have outside pipes (e.g. garden hose hookups) find the inside valve for it and turn it off, then open the outside valve until it drains then close it again. There may also be a button on the valve to let air in to purge it easier.
If you have pipes in a crawlspace exposed to the open air, leave a cold tap at the farthest line of any branches open to a drip to keep water flowing. If you can measure water temp, you can see how close it is to freezing to know how bad it is. This can prevent your pipes from freezing and bursting.
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