Zinc tablets might be the most foul tasting pills known to man
Hard booze, in copious amounts. Gotta kill them germs!
Sinus rinses are helpful, and when you feel that initial sore-throat feeling gargle some salt water (often). It'll really help.
another vote for vit C 3-4 tablets first day you feel the symptoms. Then at least two a day until cold is gone. Since I started doing that, I have noticed cold have not been as severe, or last as long. If I start feeling a sore throat, I wash, gargle with mouth wash. I have not had a major sore throat since I started doing that. Also with the sore throat, keep something in your mouth. Vit c drops, cough drops or even hard candy keeping the throat moist seems to keep the irritation down.
Along these lines I gargle, then swallow, apple cider vinegar. Someone tild me this on day 4 of a horrible sore throat, I did it and nothing happened...until about an hour later it completely went away and never came back. Ever since, when I feel one coming on I gargle/swallow and haven't had any more sore throats.