Maybe it was the first snow or the first prolonged stretch of 20-degree weather last week, but it’s definitely the time of year for a hot water bottle. The old-fashioned granny gear gets a facelift with this cozy bottle and cashmere cover from Jonathan Adler, $98. Slip it between your sheets a few minutes before bed, and you won’t have to dread plunging your feet into the freezing depths of your covers.