All of the above. They have a huge list of different beverages and ingredients you can add (the options take up the entire interior wall on the right side). You can even get actual brewed tea or blended fruit juices and smoothies. They literally have thousands of possible combinations (millions if you count the unrealistic nasty combinations).
I've ordered them with bobas, bursting bubbles, and bobas mixed with jellies.
They probably use flavored powder or syrup with water, ice, and tapioca pearls.
Thanks! Your answer is awaiting moderation.