Adding water has caused some problems to quite alot of the Source editing community. In this tutorial I will show you how to add water into your map.
To start off you need the area where you are going to have your water. As shown below, I am using a very basic area.
To make the water you must first have a brush which must be textured on every side with "tools/toolsnodraw". This brush is going to be the size and shape of your water.
Next select the texture application tool and apply the water texture you want to use to the top face of the nodraw brush. I am going to use "liquids/water_pretty1". When you have done this, it should look something similar to this.
This is where the problems tend to occur. Most people would now just compile and in-game would get this rather nasty purple tinge.
To stop this happening, we must select our entity tool and click anywhere within the map. When the entity is still selected, press alt+enter and a dialog box will appear. From the list choose "env_cubemap" and leave the settings on their default. Your map will look similar to that of below.
Thats it done. When you compile the map and open it, the water should look like this.
Contributed by Cr4ig