Hi. I am concerned about my 80 year- old mom who has fluid on her lungs. She has finished her antibiotics, but is still coughing. Its a productive cough. And comes on more at night and when talking. We told her she needs to go back to her doctor who told her to drink ice tea, gatorade and/or vitamin water. I suggested hot tea and to stop drinking milk, which she drinks twice a day. My question is what can she do to relieve her hacking cough. Sometimes it gets so bad she has to stop talking and drink something. She also takes cough drops. Is there anything else she can do for her coughs, like maybe a vaporizer? And also go back to her doctor. She has had this cough since January. I believe. Thank you