Before COVID hit, Aulani did offer resort refillable mugs with 3-4 refill stations but since the pandemic, they have not brought this back as far as I know. When we were there in February, all the refill stations were locked up. Maybe someone will have more current info for you. I know the popcorn bucket refills were given in a popcorn bag & not directly into the bucket at Ulu Cafe (counter service near adult pool).