drinking spring water; taking the waters; medicinal onsen water drinking
Refers to drinking natural spring or hot-spring water, often for health or therapeutic purposes. Common in contexts of onsen resorts and balneotherapy.
In this hot spring area, drinking the spring water is said to be good for your health.
I tried the hot spring water at the drinking fountain.
Compound of 飲 (drink) and 泉 (spring). The reading is on'yomi, suggesting a Sino-Japanese origin, likely coined in the context of balneotherapy.