These have got to be the dumbest scientific geniuses ever. Inuyasha was *expecting* to drink methanol? You do realize that stuff is poisonous, right? And "pure ethanol" is not much better, though you might be able to drink a small amount without going blind, at least. And the word is PUKE not PEWK, as in "he drank ethanol and began to puke as his body desperately tried to save itself from poisoning."
Beyond that, Inuyasha and Kagome (and everyone else too) are not even in character. Combined with the "AU" setting, what was the point of writing a fanfiction? It's like trying to make macaroni and cheese but instead of macaroni, you use raisins, and instead of cheese, you use peanut butter. Even if you come out with something just as good, there is no reason it should be considered a related dish. You might be better off just changing the names and making this an original fiction.