^ YEAAAAAAAAAAH MAAAAN.
I need to get me one of those - might as well wait til I can get one in India though, spring is pretty much here.
For colds - ginger thinly sliced in every hot/warm drink, chewed ginger when I walk in the cold/just came in from it(this works really well in drying that mucus out), honey, Yogi Teas have a good one for cold weather called "Cold Season".
Apples, blackcurrants, oranges, anything with plenty of Vit C is good, plus carrots and a bit of natural yoghurt are also good for you immune system.
Garlic is a good booster as someone mentioned - Make a super smoothie

with some echinacea added.
Also avoid drinks that are lower than room temperature at all costs, Drew.
and I would suggest you steam bath your head - with a bowl of hot water infused with rosemary, sage sage and more sage, eucalyptus, etc (research it a bit), towel over the head and just sit above it and breathe it in through the nose.