"Maris Eater -> type of Alchemist Potion". It even has his thought process in a panel, man. Start reading, stop skimming.
A potion with "Eater" in the name sounds very corrosive to me, which would be the last thing I'd want to drink. Just because we can see his thought process, doesn't mean it makes sense.
I mean, his thought process is the equivalent to: "liquid nitrogen" => "liquid" => "it's a drink". You don't have to be a genius to see how WRONG that is.
And for those who can't see it: DO NOT ingest liquid nitrogen. It can quite literally kill you. In fact, there are A LOT of liquids that can do the same, some more painful than others.