One of the mysteries of the English language finally explained.
1A bottle or flask used to carry drinking water, especially when travelling, often made of glass or (in later use) plastic.
2A bottle for holding drinking water on a table for use at meals, in a bedroom, etc.
3A vessel of leather or skin used, especially by a water carrier, to transport water for domestic use.
4A bottle for holding water for purposes other than drinking.
Late 16th century. From water + bottle.
water bottle/ˈwɔːtə ˌbɒtl/
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