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.
1 Lemon juice is also a natural antiseptic, which is useful in kidney health because it many help prevent bacteria from forming in the kidneys and causing an infection.  Vitamin B6: All B vitamins are healthy and beneficial for the kidneys.