Actually, windsheild washer fluid is already mixed with water, usually in a 1 to 2 or 2 to 2 ratio. You should try using windshield washer fluid straight out. That's what I'm planning to use.
Some do include extra agents, so you have to carefully look at the bottle for an accurate description of what's in it. Strangely enough, the cheaper it is, the better chance there is that it won't have any additives. Just stay away from formulaes with bug repellant, or anything nasty.
I knew a place that sold it out of a 55 gallon drum: you just bring in your gallon jug, and he'd charge a buck or two. Unfortunately, I've moved since then... but maybe a local garage can fix you up that way.
There's a thread in here somewhere with an analysis of methanol as a coolant, just search for "windshield washer".
You don't have to worry about evaporation a whole lot, because the mix with water will keep the methanol in the system, just by cohesion, but it probably wouldn't be a bad idea to put some kind of filter to impede that.
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