药水 (藥水) yào​shuǐ
lotion noun
medicinal liquid preparation for topical application to the skin or eyes

This liquid medicine should be applied to the wound three times a day.

liquid medicine noun
medicinal preparation in liquid or bottled form, typically for oral consumption

The doctor prescribed him two bottles of cough syrup.

Yaksu noun
Yaksu in North Korea, near the border with Liaoning and Jilin province

During summer vacation, I want to visit the mineral springs in North Korea.