the first day of "the Seven Pillars of Health" (and several after) are about water and getting enough of good water.
- your body is about 70% water
- your muscles are about 80% water
- your brain is about 85% water.
If you don't get enough water, your body suffers. And...you lose about 2 quarts of water every day just by living.
Short story...get enough water. Take your weight, divide by two and drink that many ounces. yes. that many.