Adding water to a map?

[KijiruX]

I am pretty new to SoM and would like to know how exactly I would go about adding water to my maps. I know that I would have to import some models but that is where I get lost, can anybody set up a tutorial on how to do this (preferably using pre-made water, as I am no good at modeling)? Thanks.

Edit: I have found some water sheets here: https://jdo-translations.100webspace.net...loads.html
Unfortunately, I have no idea how to install or use them. ‎