So where would I post this?

[tandkvd]

It should IK, because as long as there is a ice and water mixture it will be 32 deg. F. And the wine bottle will be in contact at all points to help with the transfer of heat from the wine to the ice/water mixture. If you only have ice in a bucket there are air gaps between the ice and the wine bottle, that is, not all points of the wine bottle are in contact with the ice. And air is an insulator which would inhibit the transfer of heat to the ice.