Can you wash your face with vinagar and water?

The pH balance of your skin is quite important and washing your face with vinegar can add alpha hydroxy acids (AHA's).   There are marketed sources of AHA's, just ask someone in a drug store and I'm sure you'll get a lot of information.  It also seems that sour milk and yogurt are good sources of AHA's, it's even said that Cleopatra bathed in sour milk, this I would advise against.

You can make your own solution at home to use when you wash your face, all you need to do is dilute