Can you go back for a refill even after leaving? I'm about to go to Costco again in the same day and I want a refill.
How much do you weigh ?
You probably won't get caught, but the worst that ever happens is they ask you to show your receipt and if you don't have one or its not from that day they tell you you have to purchase a new one.
The staff at most of these places are way too busy or inattentive to notice every single person to come into the place let alone if they're getting refills. As long as you don't come in looking like a hobo and carrying empty jugs of milk to fill up nobody is going to notice you. I have no idea how people get caught.
Smuggle the cup into the store in your trench coat/fedora. It's winter, people wear big coats this time of year. Or you know. Buy a new fucking drink for like 80 cents you fucking kike OR EVEN BETTER buy a full bottle of soda that isn't watered down moldy fountain shit.