"What do the men drink?"
Translation:Was trinken die Männer?
"What" is a question word, so that rule (the "not a question" part) doesn't apply. What they mean by "(not a question)" is that when asking a question the verb is often first. As in "Do you drink coffee?" = "Trinken Sie Kaffee?". Maybe this link will help you more? http://coerll.utexas.edu/gg/gr/con_06.html