Keybind Procedure for hand location

Is there a way to make a procedure that is able to read the hand location (where the crosshair is touching a block)? I am trying to make a procedure that will use a keybind to place a block (water, specifically) where the user is facing towards a block. If anyone knows how to provide the dependency for hand location, or knows a handy way to do this in another way, I would really appreciate the help!