2000 Ford Taurus Window Washer Fluid

I was wondering what can be done to fix a problem with the windsheild washer fluid. I live in Wisconsin and it has been extremely cold here recently and the washer that was in the car's reservoir tank I just found out was only good down to 32 degrees F. Is there any good way to fix this problem or do you have to put the car in a heated garage and let it dethaw and then drain the tank?