[Redway]

Or would you be hesitant about doing it so-as not to feel like you’re wasting the bartender’s time pouring something they won’t profit from (or some other reason for your no)?

I do it when I’m skint (I’ll admit) and still want to be in the pub-atmosphere without paying for what I can’t afford, but more commonly (and importantly) it’s to keep me hydrated enough and replenish electrolytes I lose from excessive sweating. The only medical thing that controls my hyperhidrosis (over-sweating) at this point is a medication called topiramate (which can also make people lose lot of weight, but on-label it’s more for migraines and seizures, especially in t’UK) and I only have occasional access to it at the moment. So it’s partly financial (that time of the month, skimping around before payday) and partly so-that my state of health in the hydration-and-electrolytes department will be alright.