water station; watering point
A place where water is supplied, such as a tap, fountain, or refill point for vehicles, trains, or in disaster situations.
公園の給水所で水筒に水を入れた。
I filled my water bottle at the water station in the park.
災害時には給水所が設置される。
Water stations are set up during disasters.
Compound of 給水 (kyūsui, 'water supply') + 所 (sho, 'place'). The exact historical derivation is straightforward; the word is a modern compound for a water supply point.