What's the name of the tray for cups in the water dispenser?

The water storage tank of the water dispenser is also called the smart seat.

Intelligent seat of drinking machine: located between the barrel containing bottled water and the body where the barrel is placed. Its structure is relatively simple, mostly approximately cylindrical. When there is less water in the water outlet above the water dispenser, the water will flow out of the bucket and pass through the intelligent seat. If there is enough water at the water outlet, the filter screen above the intelligent seat will float to prevent water from flowing out of the bucket and from overflowing.