I’m another one drinking lots more water than I used to because of a kidney stone. I was originally targeting 2 liters a day, but I’ve stopped measuring now that I’m in the habit of always having a glass of water nearby. It’s held off a repeat for over 10 years now.
An interesting thing: Throughout my life I was prone to minor but annoying headaches that would often come on toward the end of a day, particularly when I was more active than usual. Those essentially stopped once I upped my water intake, so my guess is that they were being brought on by (minor) dehydration.