DIY windshield washer fluid

For a simple "recipe", this thread is surprisingly difficult to follow.

The product in post #7 requires methanol and water to be added to "the capful" of the product.
Where does one buy methanol or ethanol?

Years ago, I whipped up a batch of "rubbing alcohol windshield cleaner" and when I squirted it, my passengers cried out. One, a recovering alcoholic, claimed I was threatening his sobriety.
I told him if he was drinking this stuff, he'd have rapidly developing problems.

I have one l of 99% isopropyl left.
 
303 tablets or Nextzett mixed with distilled water is all I’ve done for years. In the winter time, same protocol but with winter fluid I get once you’re above Sacramento/Auburn.
 
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