It is normal to experience a significant urine output shortly after an intake of free water (no salt load). It can be really accentuated if you take a mild diuretic for hypertension.
It is very difficult to harm yourself with water, but it is possible. It is called psychogenic polydypsia and it is only seen in people with mental illness or developmental problems who drink 20-30 liters of water a day. When this happens, the electrolytes in your system get diluted, especailly sodium, and nerve tissue does not work right. If it goes on, I guess it could wipe out the electrolyte gradients in the kidneys.
Too little water can lead to dehydration and kidney damage fairly easily.
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I was there to see beautiful naked women. So was everybody else. It's a common failing.
Robert A Heinlein in "They Do It With Mirrors"
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