With the Xanadu LTFly LISP utility you can generate AutoCAD linetypes with embedded text on the fly ("WATER", "OPTICAL", "ADSL", etc.).
Just start LTFly with the LTFLY command and type the desired text or special character(s). The new linetype containing your text string will be created automatically and you can immediately use it in the current drawing.
The embedded text will use the current text style so make sure the same text style is available in other drawings if you want to use this linetype definition there. You can export the .LIN definition (file) using the LinOut utility.
The newly created linetype is named accordingly to the embedded string. If this name cannot be used (special characters), a random name combined with your username will be applied.