From the perspective of the Duke of Zhou interpreting his dreams, dreaming of drinking cold water indicates that he will gain achievements and honors through hard work.
Dreaming of washing your hair or taking a cold bath with cold water usually indicates illness.

I often dream that I am soaking in cold water, which is a hint that my body is cold and my disease hides. This kind of dream not only reflects the hidden disease hiding, but also the inability to find a sense of support. It is a manifestation of the inability to find a sense of security in the soul and the inability to find the warmth from the soul.

: Drinking cold water will make you rich. 'The Duke of Zhou Interprets Dreams'