生なま水みず

noun

unboiled water; raw water

Refers to water that has not been boiled or purified, often with the implication that it may be unsafe to drink.

• 海かい外がいでは生なま水みずを飲のまないほうがいい。

  You shouldn't drink unboiled water when abroad.

• 生なま水みずでうがいをするのは避さけてください。

  Please avoid gargling with unboiled water.