Black
The radical black and the kanji black are exactly the same.
こく
くろ
None
You're in a completely black room. There's no way out, and you can't see. The room starts to fill with liquid. It gets in your mouth. You taste it. It's Coke (こく)! Mm, tasty Coke.
You need to drink all this Coke, otherwise you're going to drown. Drink this Coke and keep tasting its cold sweetness as you drink it all to survive.