Would "Con rắn uống trà." also be correct?
Yes. It's more natural than "uống nước trà" (don't know if it supports by Duo though).
Yes, it is. It's the sentence I entered as well. :)
So, 'nước' is a classifier for liquids? Can it be used before any liquids or it's not common?
You can use it for beverage (maybe), but you can't use it with chemistry element :)))
er... does snake drinks tea?
No, definitely no.
no in furturistic will have the robot snake to drink a tea
why the snake drinks tea ?
Because the Mods like things happen like that, so they let the snake drink tea.
Because the snake is thirsty. Obviously!
Is nước necessary? Or is it optional? Should I add nước to all beverages? Nước cà phê? Nước Sữa
As far as I can recall this is the only occurrence in DL where nuoc has been required, I don't think you would usually use it in normal conversation.
if I write "trè" for tea instead of "trà" is it wrong
Because the correct orthography is chè... (north vietnamese)