To enable an inner plug to be easily dried.

This drier is constituted by a main body 22 of the drier having a drying chamber 24 storing either a main body of a water bottle or an inner plug 14, and a blower means 40. The bottom part of the main body 22 of the drier is applied as a base 26, a substantial central part of the base 26 is provided with an air blowing hole 28 and a communicating hole 30 communicated with surrounding atmosphere and an air blowing port 44 of the air blowing means 40 can be installed at the communicating hole 30. The inner plug 14 is put, an opening or closing lid 50 is closed, a switch is turned on and air is blown into the drying chamber 24. Thus, it is possible to dry the inner plug 14 within a short period of time.