To make it short, seems like his One to One exchange is:
1) Got bad drink, return to the waiter for return, waiter return to the kitchen for replacement, kitchen refer to drink specialist to rule out mixture error etc, specialist refer to nutritionist to check if the new recipe taste good but bad for health etc.
2) Approved.
3) Nutritionist send to specialist for taste test, specialist send to kitchen for storage, kitchen send to waiter for distribution, waiter send to customer for one to one exchange that took hell of process.
4) Customer complaint because waited too long, he only get himself drinking water because too thirsty, waiting for that particular drink.

Now that's a reminder for us all what is one to one exchange. Return your drink and get a new drink or return a drink and go through hell of process.