I live down south in AR and we don't have any "good" washer fluid available here because we never really need it. I seem to forget this when I drive up to NY to visit my family during the winter months. It freezes up pretty darn regularly and then I remember the problem all over again.
I park the vehicle in thier garage overnight and by the morning it will have thawed out. I can then run all the crappy "southern style" cheapie fluid out of the resevoir. The "good" northern style washer fluid goes in and we can then drive in the cold without worrying about the washers freezing. It isn't any more complicated than that.
-Mark.