Work permits or employment certificates must be obtained from your local school for all minors 14 and 15 years of age before beginning work. 820 ILCS 205/9-12.
The key in using apple cider vinegar to treat kidney stones is consistency. You should take apple cider vinegar every day with lots of water until the stone is completely dissolved, or the pain from the kidney stone (and accompanying issues while urinating) goes away completely.
Uneducated people may tell you, Do not drink apple cider vinegar if you have acid reflux disease, frequent heartburn or peptic ulcers, but in reality, apple cider vinegar will regulate your body's pH levels and entirely heal ulcers (vinegar is even used for topical acid burns to heal), cure acid reflux disease, and end heartburn.