Mostly Koreans don’t drink running water. We drink purifying water from either water purifier or bottled mineral water. Every household and public places has a water purifier. Bottled mineral water is the drinking water of choice in Korea and can be bought absolutely everywhere for dirt cheap. A two-liter bottle will cost you a mere 1000 won (1 USD) at a local supermarket and a twenty-liter jug delivered to your home generally runs about 5,000 won.