Ginger

Ginger is a natural home remedy for a lot of illnesses.

It is a perfect remedy for cold and cough.

It has antiviral properties.

You can use it in tea and you get it's antiviral properties along with a good taste and very nice aroma. 

You can mix Ginger juice along with lemon juice and keep it in refrigerator and taken 1 tsp of this mixture , add a cup of lukewarm water and drink everyday  to stay fit.