There are two lids on the top and bottom of the water cup, which can hold water in two directions. Before using, the user needs to open the lid to install the juice popping beads in the lid, close the lid and let the water cup stand. Because the cup uses an hourglass shape, there will be more and more water below. If the user does not drink water in time, the weight of the water will explode the juice beads through the baffle. At this time, the concentrated juice in the juice beads will flow out, causing the water under the cup to change color. The color in the cup changes from transparent water to the color of fruit juice to form a color sense, which intuitively and effectively reminds and persuades users to drink water.