Incredible Night Wave Light System
You don't need a UHD projector - you could probably use one or more "discarded or for sale cheap as not new enough" projectors at HD or lower resolution. This sort of thing seems quite common (if tacky, to my taste) in modern art installations for the sort of effect you seek - best example I recall as closest to yours was raindrop ripples all over the floor, and I happened to recognize the 1080P projectors they were using. 

As for water ripples (specifically), any point light source (need not be a projector - some LEDs would work well), a (clear) tank of water, and a ripple generator of some sort. We used to do this with overhead projectors and a 12x12x1 inch tank to illustrate waves in physics classes. Bounce off mirrors if you need it anywhere other than under the projector, gravity is uncompromising when it comes to water.

But do realize that when looking at movies these days, most of the effects are added in post-production and never got any more realistic than numbers in a computer. So what you see and how it appears that they did it are generally unrelated.