Answer (1 of 10): Washer fluid blended for Winter is readily available, if none is available as a stop gap add isopropyl alcohol to the fluid.
Prime Guard Power Blast 1 Gal. -20 Deg F All Season Formula Windshield Washer Fluid with Antifreeze - Providence Building Supply
What should I do about frozen windshield wiper fluid in my car? - Quora
How to unfreeze frozen windshield wiper fluid, and how do you get it out of your car if you can't use a hairdryer or something to melt it - Quora
Where in your car do you put windshield wiper fluid? - Quora
What to Do When Your Wiper Fluid Freezes
Best Windshield Wiper Fluids for Your Car - AutoZone
How to unfreeze frozen windshield wiper fluid, and how do you get it out of your car if you can't use a hairdryer or something to melt it - Quora
How to Add Windshield Washer Fluid to Your Vehicle
Windshield washer fluid container is the perfect funnel for windshield washer fluid : r/lifehacks