acidophilus is a substance found in yogurt, although you can get it by itself as a supplement. I've found that yogurt (only with active cultures) is a much tastier way to get it. I have a daughter that had frequent ear infections requiring antibiotic treatment and our routine has always been to make sure that she gets plenty of yogurt during and after treatment to replace the "good" gut bacteria killed by the antibiotics.
OOO is oil of oregano which can also be purchased as a supplement. It's been used for centuries and does have an anti-yeast property to it although it generally takes several weeks of treatment to have an effect.