The Singer's Dream is accessed via the stockpot that turns up on The Bastion during the Story. Just below the core in the middle.
I did this in New Game+ at level 10.
Drinks;
Squirt Cider
Mender Mead
Hearty Punch
Bastion Bourbon
Werewhiskey
Black Rye
Whale Ale
Bull Brandy
Lifewine
Leechade
Weapons;
Galleon Mortar / upgrades = L/R/R/R/R
Scrap Musket / upgrades = R/L/R/L/L
Turret Suprise
Attack from distance. Use the mortar for almost everything. The birds are the worst. I used the mortar on them but with the last upgrade on the right (stops you taking damage from the mortar) I was able to drop mortars on myself which killed the birds too. A turret will also help.
I saved three tonics for the last round and they did help.
Try to be brave with your healing potions. Your drinks build will be getting you some health back. Try to save your potions for the end. I didn't use any black tonics until the final level at which point I placed them all down at once and let them finish it for me.
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