If you said, "He never drinks." An English speaker will usually know that you're referring to alcohol
Is "nie" a short form of "niemals"?
I'd say "nie" is the base form and more common. "niemals" is more emphatic.
Doesn't "nie" usually go to the end?
yes, but much more frequently used than "niemals"
Is nie used kind of like an adjective?
Why: "He drinks NEVER alcohol" isn't accepted? Nie means never, no?
Word order. You would have to say "He never drinks alcohol" in English. The word 'never' always goes before the verb.
Can you put "nie" before "trinkt" then? Why does nie go after the verb?
German has a different word order than English. The conjugated verb goes in the second position in every case I can think of. Er trinkt nie Alkohol
Can't we say "Er trinkt kein Alkohol" ?