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.
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.