I'll have to remember that lemon juice one. May come in handy. I mean... eerrrr... *carefully backs out of the room*
Anyway, if you feel yourself getting cold, drink a spoonful of Apple Cider Vinegar a few times a day. It's especially good for a sore throat, caughing, or a runny nose. It tastes like hell, so don't try to taste it. Just knock it straight back.
H-D