Hello Ohio!
I do drink a great deal of water on a consistent basis. About two quarts a day and more when I am exercising. I really watch myself when running and even when I am golfing during the summer.
Being a long-term ostomate, I have lost some kidney function, but I am at about 80% of normal. Periods of not drinking, such as when I have had blockages, is definitely hard on one's kidneys and it apparently can damage them.
I hope this helps.
I might add that from age 15 until now (age 72), there is nothing in life that I have wanted to do and was held back by my ileostomy. In 1972, my wife and I backpacked through Europe for two months. Those were the days of gluing the pouch onto skin and hoping for a day or two without leakage.
A friend here in Vancouver, Rob Hill, climbed Mt Everest and K2 with an ileostomy. He is quite the guy. He was sponsored by Convatec.
All the best,
Earl