The one I'm specifically interested in is Wheat Bread. I've searched all kinds of ways and can't seem to find Behr LRV values.
The general outline of this therapy can be found here: Best natural cough treatment. This is the way how you can stop coughing for good. An additional factor to stop coughing naturally is to use Earthing for grounding the human body to get Earth's electrons to reduce inflammation.
Prepare your bedside. In case you start coughing in the night, have everything you need by your bed -- a glass of water, cough medicine or drops, and anything else that seems to help. The sooner you can stop a coughing fit, the better. Continually coughing irritates your airways, which can make your nighttime problem last longer.