Beechams all in one tablets seem to work for me...honey and lemon I have heard too.
My friend use to do the weirdest thing....make honey and lemon with hot water and proceed to put a full pack off halls soothers in the drink and consume when disolved, worked a treat apparently!
Cups of steaming hot water , one after the other , will kill the cold bugs inside of you .... a bowl of soup taken in between will help too ........ you have to sip the water as hot as you can possibly take it ...... doesn't taste very nice though!