I'll grant you that Ethanol is a toxic substance to possibly every organism on Earth, and that methanol is toxic to many things, but not necessarily everything. Not every alcohol is toxic. According to you, glycerin, an alcohol, is toxic. So we should stop using it as a medicine. Furthermore anything in sufficient quantity is toxic. Oxygen is toxic to humans in sufficient quantity. Which is why divers don't use pure oxygen for diving. We need a little nitrogen in our oxygen (although there are certain medical exceptions to this rule). It seems to me, you are the one not being scientific. the NOVA organism you're looking for is the one I listed as living in rock. As I said, I'm no biologist, and thus can't really debate how much water any given bacteria may have in it.
While I can't prove that there can be live that is not based on water, you have not offered any theory to prove that silicon based life using an alcohol is not possible. Once you rule out the impossible, anything left is possible. It is unscientific to preclude or conclude, without evidence or defensible theory, that something is impossible.
In fact, I'll submit that intelligent life is not possible without alcohols. For example you would quickly die, after your neurons stop firing, if all sources of the alcohol choline were removed from your diet. This would be a very difficult thing, almost any food you eat will have some choline source in it. I know of no advanced lifeform that could survive without alcohols. Therefore, by your own standards, alcohols are essential to life.