All you need is some water and ingredients, which are all easily available.
What do you need:
Boil a glass of water in a pan. Take half a tablespoon of each of these ingredients and mix it in the boiling water. Let it simmer down well and once done, cool it.
Strain your solution and consume the drink. You can also choose to soak the ingredients in water overnight and consume it fresh the next morning. Both methods work well.
If you find the taste a little bitter or pungent to your liking, you can add a spoonful of honey in the drink, which again, is a powerful immunity-boosting elixir for the body.