I don't have cepacia, but have had coughing spells increase, lately. I'm a 40 yr. old w/CF.
The kind of coughs I hate (and worry about the most) are the ones that get me so dizzy sometimes, I see stars! Not good while driving, though it only happened once.
The other kind I hate, which coincides with having a cold, or sinus infection, are the dry coughs, some of which start in the middle of the night and last for an hour or so. In that case, I gargle with water and salt (just a little), or some stuff in Japan that looks like iodine.
In the case of productive coughing, I try to keep tissues nearby...for a long time I thought swallowing the mucus was ok, (maybe gross, but important to be mentioned) but in actuallity, it's not, and best to be detracted from the body.
For EB24, your coughing may NOT be CF Lung related...I was told by a doctor that some of the coughing I had (only recent) was potentially related to the gasses of the stomach acid being irritable on the lungs. I'm not a doctor, but this may give some info for you to ask if it's a possibility. since in chemestry, water is a base, and hydrochloric acid, same as what's in the stomach, is an acid, perhaps drinking water cuts down on the reaction, but the chemicals in the cola, and candies (not sure about the candy, but the carbonization from the cola, may be a culprit in aggrivating the stomach acid) may be increasing it.
Worth checking out, eh?