How does ps make a reflection in the water?

Replicas of still life that are generally reflected on the water surface are symmetrically placed in the water surface area up and down, and then a blending mode is made according to the specific tone of the water surface, usually soft light, or simply reduce the opacity; If you want the reflection to follow the ripple effect of the water surface, you can consider the distortion/ripple or/wave effect in the filter, and use distortion to replace the filter in the advanced stage.

More detailed treatment depends on the specific photos.