Is a stall selling drinks a 'drink stall' or 'drinks stall'?
We would call them a 'drink stand' here in the US. A stall has a different connotation here.
Not a teacher -- AmE native
"Drinks" when used as an adjective is BrE. For example, Queen Elizabeth the Queen Mother had her footman bring a drinks tray to her suite every day at 4:00. In AmE, we'd say that President Obama selected a cocktail from the drink tray brought to the Oval Office.