When your windshield-washer reservoir needs filling, raid the liquor cabinet to make your own washing fluid. In a screw-top gallon jug, mix 3 cups vodka (the cheapest you can find) with 4 cups water and 2 teaspoons liquid dishwashing detergent. Screw on the cap and shake well, then pour as much fluid as needed into the reservoir.
Cheap and Easy to Make DIY Windshield Washer Fluid
To make your own washer fluid, you just need to mix a gallon of water with 1 tablespoon of dish washing liquid and ½ cup of ammonia (for anti freeze or vinegar. You can also add a few drops of food coloring so that you know what the liquid is for.