This might answer the vinegar question, one guy even mentioned its use for UD2.0 refeeds.
Vinegar Discussion @ Hypertrophy Specific

From what this person calculated based on the study (in rats mind you) this is the breakdown:

Quote:

The concentration of acetic acid was 0.2 gm per 100 gm of food ingested. Regular household vinegar is about 5% acetic acid. To get 0.2 gm of acetic acid you would need to drink 4.0 grams of vinegar. Vinegar's density (1.0056 g/cm3) is about like that of water, so drink 4 cc per 100 grams of food. If you are carb loading before an event, you could take in 4cc for each 100 grams of carbs you eat.

But still people mention taking tablespoons after that so I don't know how definative that is.