I'm nowhere near an experienced plumber but I have winterized our 100-year-old home in Yellowstone about 2-3 times each year over the past decade and can share some experience I have had - with so far, never a problem. Obviously we have temps stay near 30 below for weeks and face many of the problems described here (except the swimming pool - lol).
While some professionals may have contrary advice, I strongly recommend against what some have suggested here about turning off the water at the main line and opening the faucets and draining the lines. The problem with that action is that you will NOT come near to draining the water in all important areas (joints and valves) unless you blow the lines with pressurized air. The slightest drop of water at a ball valve will crack upon thaw so it is imperative to remove all water if you aren't going to let the water dribble/flow. Furthermore, this bowing of the lines must be done until all moisture no longer is visible when the air is released through each faucet (including other areas like the washer and dishwasher). This takes patience and a lot of time (I run about 50-60psi for about 45 minutes throughout the house using a compressor/tank that we permanently installed in the interior).
My point is, either let the water stream out all outlets or blow the lines out entirely. Turning off the water without blowing will be a costly mistake.
Granted, BCS isn't Yellowstone but for the coming week, it is darn near acting like it's stepchild. Again, there are likely more experts on this board however the principle above had worked flawlessly for us and those colleagues of ours in the area who skimped on being so tedious, have had their share of broken valves and pipes.
Hope this helps.