The correct answer is coke, not soda, not pop, but coke. Coke covers all brands, i.e. 'Can I have a coke?'
'Sure, do you want coke, diet coke, sprite, dr. pepper, 7up, root beer, etc?' Locals know what I'm talkin' bout, ya heard me...
Point of order: The correct answer is "soft drink". We will also take "cold drink" or "cold drank". Alternatively, you can just get a drink from the hose pipe.