Well as far as I understand,there are a couple reasons for water/meth instead of straight alcohol.
As stated corrosion: eats everything - can`t let it sit either.
:fire hazard -water/ meth is not fuel ,straight meth is and requires all the safety and restrictions gas does. IE.lines,tank,shipping,storage etc...

I`ve seen test after test,the stuff works. Does meth only work better,yes.... But what is your goal??? What are you willing to do to get it????