Yes, you can drink sour milk. You can still use the milk if it does not have an unpleasant odor or flavor. Milk that has gone a little sour is still safe to drink. The bacteria that cause milk to go bad also cause diseases such as diarrhea, so you should avoid drinking raw milk if you are breast-feeding or take medications that make you more vulnerable to infections. Sour milk can be used in recipes that call for regular milk. However, some people may want to avoid using it because of the added acidity. If this applies to you, substitute sweetened condensed milk for the sour milk in any recipe. The safety of drinking sour milk has been proven time and time again by science, so there should be no concerns about drinking it regularly. In fact, many countries around the world enjoy drinking sour milk every day for health reasons! In conclusion, sour milk is safe to drink and can be used in place of regular milk in recipes.