Hey i just watched live stream with water examples witch inspired me to upload my old shader that can fill entire game space at once and move with player thanks to vertex shader transformations
how it works
place included mesh in center of level keep x and y =0 you might change z to adjust water height
apply material instance if necessary
in object details panels set bounds scale to something big like 9999999999999999999999
so water will be still visible even when original bounds would get out of view
tweak values and modify shader to your needs
might want to switch to movable and disable shadows and collision