To create a back up of your folders you need to copy your Feral Heart folder and paste it into another folder (Such as My Documents) where you will remember where you put it. That way, if you lose something you can get it from the back up folder.
To get rid of the ripples in the water, you need to go to Options >> Video >> Water reflection then un tick the box.
Here is what you need to replace your grass textures.
[Link] (http://www.mediafire.com/?98d934keknj75qq)
Place this in Local Disk (C:) >> Feral Heart >> Media >> Objects and replace the files if asked.
If that didn't work then in the map you downloaded, I believe there might have been a 'README' Text document in there telling you where to put things, in this case you need to find where you had put the Grass textures. Report back to me with where you put them once you have done so c: