what effect does taking more of juice and tea/coffee and less water have on someone?

All I know is that too much of juice causes diabetes; but water is natural so too mush of it won’t harm your body system.

Very true

increased calories

Lie, Lie, Lie.

CrazyMan:

All I know is that too much of juice causes diabetes; but water is natural so too mush of it won’t harm your body system.

Actually, drinking too much water can be really bad for you.

Drinking too much water can lead to a condition known as water intoxication and to a related problem resulting from the dilution of sodium in the body, hyponatremia.

The kidneys of a healthy adult can process fifteen liters of water a day!

You are unlikely to suffer from water intoxication, even if you drink a lot of water, as long as you drink over time as opposed to intaking an enormous volume at one time.
As a general guideline, most adults need about three quarts of fluid each day.
Much of that water comes from food, so 8-12 eight ounce glasses a day is a common recommended intake.
You may need more water if the weather is very warm or very dry, if you are exercising, or if you are taking certain medications.