In hyponatremia, the imbalance of water to salt is caused by one of three conditions:
Euvolemic hyponatremia -- total body water increases, but the sodium content remains the same
Hypervolemic hyponatremia -- both sodium and water content in the body increase, but water gain is greater
Hypovolemic hyponatremia -- water and sodium are both lost from the body, but the sodium loss is greater
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. The bottom line is this: it's possible to drink too much water, but unless you are running a marathon or an infant, water intoxication is a very uncommon condition.
Best thing is to cycle your supplements so you bring the kidneys back to ground zero!