Gugglet, or as the OED would have it more correctly Goglet.

A long-necked vessel for holding water, usually made of porous earthenware, so that the contents are kept cool by evaporation.

From the Portuguese gorgoleta, ‘an earthen and narrow-mouthed vessel, out of which the water runs and guggles’. Also possibly the French gargoulette which has a similar meaning.

The OED records the first English use in 1698.

Kudos to my local auction house’s catalogue for teaching me a word I really didn’t know.