I have a very simple code of doing steganography that neither modifies any word of your original text nor poses any constraints on the words you employ in the text; it simply changes a little bit of where the individual lines end and should be barely detectable by the warden. However, it is fairly inefficient, capable of transmitting only 1 stego bit per line. (This is unfortunately owing to the Principle of No Free Lunch.) The code is availble at s13.zetaboards.com/Crypto/topic/6939954/1/
[Addendum] For obtaning better efficiency one can employ a recent linguistic steganographical scheme of mine: s13.zetaboards.com/Crypto/topic/9024439/1/
