also: すいびん
noun
water vessel; water bottle; water jar
In Buddhist contexts, a portable vessel used by monks for drinking or washing; can also refer to a general water container in traditional settings.
僧侶は水瓶から水を飲んだ。
The monk drank water from his water vessel.
この水瓶は托鉢のときに使われた。
This water bottle was used during alms rounds.
水筒 is a modern general term for a water bottle or canteen, while 水瓶 is more traditional and often associated with Buddhist or historical contexts.
Compound of 水 (water) and 瓶 (bottle, jar). The reading すいびょう uses the on'yomi of both characters; すいびん is a variant reading of 瓶.