“21 M♢♢N WATER” is the seventh track on 22, A Million. It was first performed at Eaux Claires 2016 along with the rest of the album.

Breakdown of the song title

The number “21” relates to 777 (7x3=21), as confirmed by the album’s artwork. 777 is considered a God’s number in Judeo/Christian religions. It follows and counterbalances the name of the album’s previous track: “666 ʇ”.
“Moon water” is “water imbued with the power of the moon” and relates to the occult and witchcraft.

Thus the numerology and wording create a contrast and dissonance, even within the track name, between the holy and unholy.