Dickinson knows what's she's doing when it comes to illustrating her poems with sound. The speaker talks about being inebriated and most of the sounds in the poem are mumbly, even slurred sounds, making a reader sound pretty drunk if she were to read it too quickly. These slurred sounds come from the abundance of soft, liquid sounds like long vowels and soft consonants. Lines 7-8 are a great example:
Reeling—thro endless summer days—
From inns of Molten Blue—
Dig all those rolling L sounds and silky S sounds here. That's some consonance at work. None of these words take much effort to say, and stringing these effortless words together gives the poem a sleepy, drunken sound.
As well, the alliteration in the poem is particularly interesting because it seems to illustrate a deterioration of the speaker's sobriety the further we move through the poem. In the first stanza, the alliteration is primarily a hard T sound ("taste" and "Tankards"), which then gives way to a slightly softer but still pretty hard D sound in the second stanza ("Debauchee of Dew"). The B sound ("Bee," "Butterflies") in the third stanza is softer still until we end up with the slippery slurring of the S sounds ("Seraphs," "Saints") in the last stanza. The sounds grow more and more in keeping with someone who's just wandering around, mumbling to themselves in awe (or, you know, drunkenness).