water bottle
/ˈwɔːtə ˌbɒtl/noun
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.
5= hot-water bottle.
Origin
Late 16th century. From water + bottle.