Perhaps I had a different experience but I was rather aggressively told by my surgeon from day 1 about all of these risks- kidney stones, the need to copiously hydrate, etc. I do copiously hydrate and never had any kidney stones in 30 years with a J Pouch. I even hydrate during the evening. I consume one 20 ounce bottle of Gatorade Zero during the evening. I leave it on my nightstand and each time I get up during the night I take 3-4 sips until by the morning when it's drained. This is how I live and I realized I needed to adapt how I live to comply with my J Pouch. I also use Metamucil 2-3x per day with 8 ounces plus of liquid.