You are lucky you are not talking to our family doctor. Apple cider vinegar turned my daughter's digestive problem around in short order. And she was swigging an undiluted spoonful just before each meal. In any case, no one is talking about gallons of apple cider vinegar.
The post by Paxiled should be taken with some caution!
Apple cider vinegar is highly acidic. The main ingredient is acetic acid, which is quite harsh. You should always dilute it with water or juice before swallowing. Pure, straight apple cider vinegar could damage your tooth enamel or the tissues of your mouth and throat.
Long-term excessive use could conceivably cause low potassium levels and lower bone density.
Apple cider vinegar could theoretically interact with diuretics, laxatives, and medicines for diabetes and heart disease.
We don't know what you're trying to accomplish. And don't worry about the above post, vinegar isn't any more a problem for teeth or esophagus than alcohol or coffee or other fermented products as long as you don't roll it around in your mouth or hold it in your throat. Remember to use only organic apple cider vinegar with the mother, because that's the food and health version. Cheaper forms don't work and can be harsher. As for garlic, don't know why you're taking it, but for most purposes only raw garlic works. The other concern is that, while apple cider vinegar balances acid and alkaline for some people, for others it throws it off -- we're not all the same and don't have the same needs. But since you're taking such a small amount, hard to see how it could be that harmful to try.
The acetic acid in apple cider vinegar may, damage tooth enamel and even burn the esophagus when taken regularly.