About 20 years ago, when my oldest daughter was a baby, we were attending a large family Christmas dinner, at my parent's home. We had put the store-bought baby formula, which was poured into a clear quart-sized Tupperware bottle, in the fridge, to keep cool. Later, as I walked into the kitchen, I saw my uncle, holding the formula in his hand, and making a grimace, with a "GOT MILK?" mustache. He looked at me, and said, "OOGUM! I think this eggnog's gone bad!"Still got eggnog in the fridge from this past Christmas, unopened. I have tried it 6 months and 1 year from expiration. Going for 18mo after this go. Haven't had any problems with it so far!
+1 for making dip. Might be the only way it's any good!!