We're on well water too, and what I have done in the past if it looks like we might lose power, is to fill a bathtub with water. Then at least you have water to flush toilets and brush your teeth. I have 3 full baths, so I might fill at least one tub, just to be on the safe side.
No snow blower here either, and the driveway is 100' long. My son was tempted to buy a blower yesterday, but there are none to be had anywhere. Seems almost like a waste of money since it could be used so seldom, but this year has him rethinking the issue!