If a friend goes out of his way to bring you a fresh cold water bottle, and you finish it, the least you can do is to go throw away the bottle. Don’t leave the bottle on the ground after you finish it. If you want people to treat you well, you must treat them well in return. This isn’t karma. This isn’t so you are guaranteed good treatment, this is being a human being. Being kind. If you do good to others, good WILL come back to you.