I have one more home remedy for dry cough. Soak some almonds in water overnight.Peel the skin in the morning.Crush them to make a paste. Add 2 tbsp of butter and 2 tbsp of sugar and Eat this mixture every morning and evening to get rid of dry cough. last month my sister suggested this remedy from http://www.homeveda.com/Natural-Remedies/Infections-and-Allergies/Natural-Ayurvedic-Home-Remedies-for-Dry-Cough and it worked well.
Make a simple and easy breathing exercise for about 15 minutes.