Funny that I only saw this thread now, sore throat is my most-hated sickness by far, and I let it creep up on me more than a week ago when I came back to cold-ass Europe from my sunny, hot home.
Best thing is to always, always destroy it the instant you feel it coming on, they vary where you are, but after my many years of experience of killing this annoying thing, the best thing are these lemon-like powder packets you mix into a boiling-hot cup of water - if you can barely feel them coming on, these will kill it immediately.
There are also these little honey/lime drops you can suck on for early strep throat as well, in Holland they're called Strepsil and they also work wonders early and fast.
If you don't have them, simply take a spoonful of honey, squeeze some lime in it and take it every hour or so, with some hot tea/foods in between. Most important thing is to start immediately or end up being miserable for days on end.