Millions of people buy honey and lemon based products for cold flu and sore throats in syrup tablets and capsules. Made with powdered lemon and cheap honey, you're definitely not getting the good stuff.
Best buying a bag of 4-6 lemons and juice them adding about 1.5 litres of boiling water. Let it cool down 5 minutes and add 2 -3 desert spoons of natural honey. Don't ever add boiling water to honey as it kills the beneficial properties it contains.
If you don't mind ginger add a few shavings of fresh ginger into it and take with paracetamol. Lemons are packed with vitamin C, honey is great for soothing a sore throat and decongestion. Ginger also has good anti inflammatory and antioxidant properties. Also echinacea is excellent for fighting colds and flu.
You are what you eat and there's a lot of truth in that cliche. I was talking to a friend earlier on the phone, he told me he can't drink lager any more as he gets heartburn and gassed up. If he does want to drink lager cider or ales he has to take heartburn tablets like Zantac or Rennies. Never needed either as I've eaten natural full fat yoghurt all my life, and not the chalk like zero and low fat varieties. Yoghurt is alkaline, neutralising stomach acid. And I have it with a spoon of natural organic honey added: )