Balance is maintained through a complex, interactive system that involves several parts of the body:
Inner ear. The inner ear has a small structure, called the labyrinth, containing three fluid-filled semicircular canals. The fluid flows in response to the position of the body (similar to the bubble on a level), sending signals to the brain that convey position and movement.
The eyes. The eyes provide visual cues to the brain, giving information on where the body is located in space, the sense of direction and the position of other objects in the environment.
Muscles and joints. The muscles and joints contain receptors that tell the brain how the legs and arms are moving and the speed of the motion. Sensory impulses from the neck provide additional information on which way the head is turned.
The skin. The skin contains touch receptors that tell the brain about the location of certain areas of the body (like a foot hitting the ground or the back resting on a bed).

The spinal cord and brain. The spinal cord contains the network of nerves, or wiring, through which communication signals are sent to and from the brain and the rest of the body. The brain is the central processing area, taking all the sensory information, processing it and telling the body if adjustments are needed to maintain balance.

The body gets 80 percent of fluids from drinks.

An adult male needs nearly 4 quarts of fluid a day and an adult female about almost 3 quarts a day.

Water is the best summer drink because it provides the fluid the body needs with no extra calories.

Plain water can be enhanced with a splash of fruit, juice or herb (like mint) for flavor