If I'm not mistaken, not all opposites are antonyms but all antonyms are opposites. This particular combination may not be an antonym, so if I'm wrong about that I apologize.
One thing of note I should mention. While the opposite of "sweet" always turns up "sour" in my mind, the opposite of "bitter" is certainly "sweet". So while I wouldn't think "bitter" is the best word to list as the opposite, it matches the description. I asked a few other people those questions and got the same answers ("What is the opposite of sweet? Sour. What is the opposite of bitter? Sweet."), for whatever it's worth.
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