Adam Clarke on 1 Kings 17:12

A handful of meal in a barrel - The word כד cad is to be understood as implying an earthen jar; not a wooden vessel, or barrel of any kind. In the East they preserve their corn and meal in such vessels; without which precaution the insects would destroy them. Travellers in Asiatic countries abound with observations of this kind.

The word cruse, צפחת tsappachath, says Jarchi, signifies what in our tongue is expressed by bouteille, a bottle. Jarchi was a French rabbin.