I know what you mean puzzled .I am lucky that having family in Germany they send me boxes of sachets of something called Hei�e Zitrone which is a lemon drink you make up from the powder. It also has magnesium in it . No medicational stuff at all and no sugar .I then put a large dollop of honey in and this is my favourite bedtime drink .
The only thing close to it here that I have seen is from Rowses the honey people .But it's quite expensive for a few sachets .
http://www.rowsehoney.co.uk/articles/our-other -products/honey-and-lemon
Can you have honey ?
Or try this ...
Any herbal tea will do camomile or peppermint preferably (which contains menthol, a cough suppressant and decongestant). Boiling water on the teabag . Let it steep, covered, for three to five minutes. Uncover, remove the tea bag, and squeeze a lemon into it .
Sip ......lovely :)