This thread has become painful for me to read so I figured I would clarify a few things.
The alcohol we would like to drink is ethanol. In the brain the most noticeable effect of ethanol is its binding and opening of the GABA-A chloride ion channel. This is the same channel that benzodiazepines and barbs. activate. This causes the neurons to become more negatively charged and thus synaptic transmission is reduced (sedative effect.) Downregulation of this channel causes the side effects of alcohol withdrawal.
-Methanol has one less carbon compared to ethanol and it is metabolized into formic acid. It’s the formic acid that is toxic to the eyes.
-Also just a side note that 100% ethanol is technically possible (with a desiccant), but very difficult to achieve. In the distillation process, no matter how many thousand times you try to distil an ethanol-water solution, the max. concentration you can achieve is 98% ethanol, 2% water. Off the top of my head I can’t think of the ratio for other alcohols like methyl or isopropyl, but I would imagine they are similar. If anyone is interested in this just google azeotrope.