how do you add them into the CS without using a Esp.?

You need to replace vanilla textures to do that. Just look where they are and how they're called, then put your texture in the same place with the same name. Like if a vanilla texture is in textures\landscape\rock.dds then you place your texture in the same spot with the same name. If you want to add new textures without replacing vanilla textures then you need an esp.

ah, thanks for that