This is a non-magical version of a devastatingly effective hangover remedy that features in Hogfather. It is included here merely as a curiosity, since the only ingredient I can easily get is the fizzy vitamin tablets.
175 ml raspberry drinking yogurt
175 ml cream soda
2 blackcurrant effervescent (fizzy) vitamin C tablets (follow dosage instructions).
Mix the yogurt and cream soda well and pour into a half-liter (pint) beer glass or mug. Add the tablets, stand back and watch. When it settles, drink it.
Hopefully you will enjoy it.