Just came across this and thought it may help with the acid/alkaline debate, although obviously if you were looking for evidence, there isn't any, but it just made sense to me.
'Not only does apple cider vinegar kill viruses, fungi and bacteria, but it also contains most essential vitamins and nutrients, making it something of a supplement. Though apple cider vinegar starts out as acidic, it has an alkaline effect in the body, making it ideal for treating many acid-linked diseases that go hand-in-hand with the modern Western diet.'