A remedy for sore throat: Icecream. Ice cubes work too, but frankly- who would want icecubes when you could have icecream? Seriously, try this if your throat is sore, the general reasoning behind this idea is that your throat is a bit swollen, and ice will make it feel better for a little while, since the swelling goes down. Also good as remedy for kids, since they usually loose their appetite if they have the flu, but they tend to eat icecream anyway, appetite or no..
For cold and general flu warm drinks are nice, though. Tea, with lemon and honey for example.
Also- whatever your mum used to give you (or do) will make you feel better.