I discovered this stuff on my first visit to Japan. Just add this sachet to a litre of water and you have a kilo of the best hangover cure known to man! You can buy it in bottles and cans. Some Japanese/Asian supermarkets sell it here in the UK also. Anyway, I can highly recommend it! If I sink this whole bottle of red wine now, I may be reaching for it in the morning :))

Pocari Sweat