The many “new” style “tea” bars in malls and shopping streets throughout the Greater China area that cater for youngsters with large paper cups of cold “tea” drinks prepare their products with tea concentrates that may or may not contain some tea extracts. They all would add some form of sweeteners and all sorts of funny ingredients as gimmicks. So this bottled version is certainly making a supermarket version of such “tea” bars. The aeration is done in the water, not in the cap which contains the concentrate. When you add an ingredient with some force into aerated water it gives bubbles, so giving you the illusion of the aeration is from the cap.
They would soon have funny things in the water for gimmicks: jelly, fruit bits, etc 😉
