Elderberry Juice! That's it, you don't need anything else…. Well, Thyme is Commission E approved for Coughs and Bronchitis, you could add some fresh Thyme to your Chicken soup along with a little Commission E approved Onion. Maybe a little Garlic. Radish Honey juice for Whooping Cough sounds a little far fetched so I won't mention it. But the Teas, a little Anise or Clove with some Mint and Honey.