how to show water and shadow on the render texture ?

hi .
i am working on a gui base application . i want to show unity simple water on render texture but when i do it water don’t show i have this problem with shadow and particles too. when i change their shader to diffuse they will show but not animated . can ayone help .please. sorry for my bad english .

you allready found an answer on this bc i have the same problem and i know it is 6 years later… XD