water bottle

noun

any of various types of container for drinking water, such as a skin or leather bag used in some countries, a glass bottle for table use, or a flask used by soldiers or travellers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for water bottle