I Taste a Liquor Never Brewed

This poem definitely has an extended metaphor; the tricky part is determining what exactly the metaphor represents. Clearly the metaphor is based off of the “Liquor never brewed” but what exactly is this liquor compared too? It seems to me that this liquor never brewed is nature. I know that we aren’t supposed to really take into account who the writer is because they are not the speaker but Emily Dickenson seems to let her life STRONGLY influence her poems. Dickenson loved nature and a liquor never brewed could be grapes or really any fruit that hasn’t fermented. Regardless the poem is still confusing to me it seems sporadic and unorganized.