What exactly is this supposed to do for a body? How can I tell if it's working?

I'm not a physician, but it is my understanding that Apple cider vinegar inhibits the absorption of carbohydrates in the digestive tract. This has the effect of limiting the influence of carbohydrates on blood sugar. As a result, many users experience moderate weight loss. It is also believed to improve other conditions such as allergies by thinning the mucus retained in your sinuses. The only way to tell if it's working for you is to try it and observe if there are any positive benefits.

The description of this product is 16oz pack of 2. Is it 2 bottles at 16oz each, or 2 bottles of 8oz each?

I got one bottle. This is not a good deal. Very expensive!! The description said 2 bottles. When I contacted Amazon they said No it's 1 bottle. Won't buy again.

How is this profduct different from the regular bragg

Well the only "regular" Bragg I ever used was just apple cider vinegar. This product has ACV, honey, lemon juice, & cayenne pepper. More cleansing power.