A container for holding water, typically a large jar or jug. Can refer to traditional earthenware or modern vessels.
I keep a water jug in the kitchen.
In old houses, they used to collect rainwater in a large water jar.
やかん is a kettle for boiling water, not a storage container.
Most common spelling; uses kana for がめ to avoid rare kanji.
Kanji spelling using 瓶 (jar/pot). Less common than 水がめ in modern usage.
Uses 甕 (large earthenware jar). Rare and literary; mainly in historical contexts.
Compound of 水 (water) and がめ (jar/pot). がめ is a native Japanese word for a large container, often written in kana.