Sounds like a lot more work than dropping a tablet in a jug and filling it with water. But whatever makes you happy.
Doesn't address freeze protection, plus the alcohol itself also provides cleaning abilities. The only other way to achieve freeze protection (that I'm aware of, without leaving intolerable residue on the window) is load it up with salt, which I don't care to spray all over the vehicle, nor have dry on the windshield because that also leaves residue.
It's not a matter of happy, rather getting the job done instead of having mental blocks preventing choosing best solution. Okay, I'd be very unhappy choosing some far less effective solution to suit the whims of someone else for faux-reasons.
However i have to take issue with your statement at face value too. No, it is less work to just grab a jug of washer fluid than be mixing it up at home with some random vessel saved to do so. I'm well aware of the amount of work to brew your own cleaner since I do, do this for most other cleaners (that cost a lot more).
What you propose, means storing that jug to reuse, still acquiring distilled water that you still have to haul home with associated container issues, unless you just use tap water with minerals in it that cause deposits and clog the sprayers, then you have to clean the system out too.
Marketing tricked you and you then chose not to accept the preponderance of evidence that causes most people to buy ready made washer fluid. If you live in a warm climate where that works, and very soft water, good for you, but it is not the normal situation so the opposite of a solution that could be universally recommended.
The ironic thing is when someone sees some small minority adoption of a product and thinks they found some secret thing, as if the group collective experience of many millions of people over a century, wouldn't have thought of that. There are a lot of things that recent tech has provided solutions for but chemistry to clean and melt, has been established for a very, very, long time.