In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Vinegar
To drink vinegar means you will have problems and sorrows. If someone close to you gives you vinegar then you will argue with them and feel bitter.