Attached is the designer's little brother's simple KS rendering small sharing yo ~

Water ripples, bubbles, and glass elements need to be combined with HDR lamps.
Use the noise bump to simulate the water ripple in the cup, and the geometric figure shifts to adjust the ripple size ratio.
The bubbles in the cup are added through geometric figures, and the density of the bubbles is controlled by gradient. If the transparent or reflective material is black, it is recommended to turn on the ray rebound and global lighting.

Adjusting the gradual discoloration of the material can enhance the contrast between light and dark at the turning point of the arc surface, and at the same time can act on the density of bubbles.
Use HDR lights to improve the texture of the bright surface, and Alpha blending mode to deepen the dark surface; if you use gradient processing, you need to pay attention to the overall light and shadow relationship.

The product in fig. 1 is together with the background meat. the light spot in the water in fig. 2 is overwhelming. after the top headlight is turned off, the ripples are soft but the light is pressed.
Fig. 4 softens the light spot by superimposing Alpha lamps, gradually optimizing the parameters and gradual discoloration of water ripples, so that the products can be integrated into the environment with distinct primary and secondary.