one gourd; a single gourd
Literal meaning: one gourd or calabash. Often appears in classical or poetic contexts, or in set phrases.
Setting out on a journey with a single gourd of sake.
small drink (esp. alcohol); drink one carries
By extension, a modest amount of alcohol, often carried in a gourd container. Evokes a rustic, simple, or solitary drinking scene.
He always carries a small drink at his hip.