expression, godan verb (-u)
agree with one; suit one; feel comfortable
Idiomatic expression literally meaning 'the water agrees with one', used when a new environment, climate, or food suits a person. Often used in the negative form 水が合わない.
See also: 水が合わない
引っ越した先で水が合わず、体調を崩した。
The new place didn't agree with me, and I got sick.
海外旅行では水が合うか心配だ。
I'm worried about whether the water will agree with me when traveling abroad.