*hot lemon juice, add boiling water and honey to make it palatable

*sage tea, great for sore throats. again, add honey

*steam inhalation. particularly with a drop of peppermint oil

*plenty of fluids

*garlic, onions, and spicy food generally. My favourite is garlic pickle with everything. No-one will come near you but then again, if you have a really bad cold they'd be best off avoiding you.

last and certainly not least:
*GET PLENTY OF REST