How can I make a water volume/lake?

The water volumes is to interact.
A quick way to do it is

  1. Add a BSP bush and line it up the the where the surface of the water is.
  2. Migrate the Lake/Ocean Material from one of the Examples or Mobile Map.
  3. Add the material to the surface and bam water.
  4. A reflective box or sphere will help on reflections, place in the middle of lake