Homemade windshield wiper fluid?
You could follow these instructions: %26quot;Combine 3 c. household window cleaner with 1 gallon water in a pail.%26quot; Be sure to read the 'Tips and Warnings' at the end of the instructions, especially regarding winter use. (Source #1)
Here's another recipe I found:
%26quot;Keep your windshield clean with a simple, homemade washer fluid. Just add two tablespoons of liquid detergent, three cups of rubbing alcohol, and enough water to fill a clean gallon milk jug.%26quot; (Source #2)
For more ideas, just Google the words %26quot;homemade windshield wiper fluid%26quot; (you'll get a lot more results without the quotation marks).
Homemade windshield wiper fluid?
It only costs about $1 for a gallon, don't be so cheap.
She's right about the price. You really should just buy it.
But to answer your question about just using water, the answer is %26quot;NO.%26quot; If you put straight water in there you will start to grow little sea monkeys and other slimy stuff that will clog your system when the weather is above freezing. Then when it gets below freezint the water will freeze, expand, and crack your fittings, pump, and possibly even the resivior itself. Straight water is very bad.
You can buy different brands for a couple of bucks if you want a better %26quot;quality of fluid%26quot;. I like the rain-X stuff.