Water intoxication danger?

It is my understanding that the human kidneys can safely filter 15 liters of water in a single day, but, this is over the course of an entire day, and consumption of a great deal of water in a single sitting can cause a dangerous electrolyte imbalance known as water intoxication. Quite recently I have found that I am quite aroused by the feeling of signigficantly expanding my stomach through consumption of water, and was wondering to what degree this can be done while safely avoiding water intoxication, as well as if this electrolyte imbalance may be offset by consuming some amount electrolyte rich beverage such as gatorade before or during the act.

As I am sure it is relevant, I am female, 187 centimeters tall (or just under 6 foot 2), and weigh 59 kilograms (130 lbs).

Yes, I am aware I am quite underweight, and am at present working to remedy this through safe consumption of nutritious foods.