If it's today I hope I hear a
Cry out from heaven so loud it can water down a demon
With the holy ghost 'til it drown in the blood of Jesus

from Kendrick Lamar – Sing About Me, I'm Dying of Thirst Lyrics on Rap Genius

Kendrick hopes he ends up in Heaven. He is asking himself if he has done enough. Also a reference to the 1941 film, The Blood Of Jesus in which the setting is heavily African-American, and a main character is introduced to alcohol by a Demon.

Also, in church the Blood of Jesus is red wine.

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