noun
natural water; untreated water; spring water
Refers to water from natural sources such as springs, rivers, or groundwater, often implying it is untreated or minimally processed. Commonly used in product labeling and environmental contexts.
このペットボトルには天然水が入っています。
This plastic bottle contains natural water.
山で汲んだ天然
The natural water drawn from the mountain is very cold and delicious.