Nope, using a pool at a resort other than yours is wrong. Refilling a non-Disney container is wrong.
Do people get away with these things? Sure they do..all the time. It's those people who travel over to my resort, plop themselves down taking up 8 chaises and several tables poolside, then head off with their 7-11 mugs to the beverage stations that bug me!! Of course, they aren't even staying onsite...they just like our pool and love the fact that they can get free drinks. Have I seen this? Yep. Saw it on more than one occasion at the Polynesian. Then once at BW. Sad to say that those folks who wanted to get their 'free' drinks at BW didn't realize that in order to do that, you have to show up at the counter, mug in hand. The CM won't fill the mug but gives you a full cup. But if they don't see that refill mug, they don't give out the soda!!! It was kind of funny to see the looks on the dad's face when he was told that he had to have a Disney mug..not just any old cup. This was at Leaping Horse Libations. I was seated off to the side so could overhear the conversation. Then, dad returned to his chaise area (had several of them as well as the table/chairs in front of me) and told his wife that getting drinks at POP was much easier. Maybe they should head over there tomorrow..not as good a pool but the drinks were free. Then, mom said that maybe they should actually stay at POP next time, and not mess around with the whole offsite thing again..way too much trouble. It was actually quite entertaining. Evidently someone else overheard them talking...a lifeguard approached them and asked to see some resort ID cards. They had none. Said 'Oh, they must be in our room.' Lifeguard told them they could head back to the room to get one then, otherwise they would have to leave the pool area. Of course they had to pack up and leave.
Poor family....no free drinks, no fun pool to use. Had to head back to wherever they came from.