Yes, it does. Vinegar’s freezing point is lower than water’s. So adding vinegar to water can help lower water’s freezing point. Of course, there are a few caveats. First, this trick only works if the vinegar is added before the water freezes. Second, the amount of vinegar you need to add varies depending on how much water you’re using. Adding 1 cup of vinegar is standard practice for every gallon of water.