for us in california, we cant use window washer fluid. i went through this when i got my afm mr. freeze kit. window washer fluid with methanol is illegal in california because so tree hugging hippy decided its bad for the environment. i went to 3 different parts store chains (kragen, pep boys, and napa) all said they dont carry it and its illegal to order it. you can just buy methanol at any place that sells race fuel and mix it with distilled water you buy from the grocery store (50/50 mix). or snowperformance sells it on their site pre-mixed at about $10 a gallon.
for smog, its not a factor. the methanol only sprays while your boosting and smog tests never go that high into the rpm range. they are done at 2500rpm max.
for tuning, you can add base timing but overall timing is recomended because with the methanol, you can run (acording to afm) 9-15* more total timing yet there is no way you can increase base timing that high. also, you will need to find a way to turn the fuel down (not through fuel pressure). you need a tuning device or dyno tune, to shorten pulse width. snow says their kits usually add .5:1 to the afr. in other words if your running a 11.5:1 afr now, the meth will make it a 11:1 afr. doesnt seem bad but with methanol you can safely run leaner then you can without it because of its cooling abilities and the fact that its more resistant to detonation. i read somewhere that methanol is similar to 110octane in its ability to resist pre-detonation and burn rate
as for how quick you use it....i went through about 1/6 of a gallon in 3 months on the street cause i barely boost on the street. havent been to the track yet since my afr with the meth is off the chart rich. waiting on my pms which afm said will ship out thursday...about time!