Fill the gap: People who drink 6 glasses of _______ daily are more optimistic, successful, energetic

منذ ٣ أعوام

What did you guess? Wine?

Do you think drinking more water will lead to a better life? 
Read this article and let me know what your ideas are for improving your life.

How about:
"a pillow that’s not too firm or too soft”

https://www.studyfinds.org/h20-happiness-drinking-6-glasses-water-daily/