Can I treat swimmer's ear at home with white vinegar and rubbing alcohol?

Yes, mix equal parts white vinegar and rubbing alcohol, put a few drops in the affected ear after swimming, let it sit for a minute, then let it drain out. The alcohol dries the water, and the vinegar changes the pH to prevent bacterial growth — works better than most pharmacy drops. Don’t use this if you think your eardrum might be perforated; see a doctor instead.