Believe it or not, Chef, some of us don't have that finely honed sense of thirst. I got a kidney stone because of not being hydrated well enough. I have to watch myself to make sure I get enough water. I keep a glass of water next to the computer. That way, I won't be too lazy to get up and get a drink when I feel thirsty.
That said, I'm not so sure that drinking water has a whole lot to do with weight loss.
Kidney stones can be caused a thousand different things; not one of which can be definitively identified as the main culprit when kidney stones do occur. Urinary tract infection, certain amino acids, the foods we eat, disease, bowel inflammation, medications, metabolic disorders, even our genetic traits that have been inherited from our parents have been known to be a cause of the formation of kidney stones. But, even though we can attach the formation of kidney stones to all of those things (
and a whole lot more), not even the best doctors or scientists can determine exactly what causes an individual's kidney stones. The best they can do is make an educated guess. With that being said...
Most of the recommendations (in regards to caloric intake, water consumption, etc) are nothing more than educated guesses as well. Just think of the recommended daily intake of 2,000 calories that we're all told to live by. That's just an extremely vague estimate as to how much we are "supposed" to be eating. Yet, if you look at each individual, there's no way that every single person should be eating 2,000 calories. Some need more, some need less. It all depends on how tall we are, how much we weigh, our muscle mass, our activity level, etc. The same goes for water. It all depends on you, as an individual. And, since the OP is the only one who knows their body and how it works, how much exercise they get each day and how well their metabolism operates, it's hard to give them a definitive answer as to how much water they should be drinking. That's why I said to drink water when you're thirsty. That is your body's natural way of telling you that you
need water. Just as when you feel hungry - which is your body's way of telling you that it needs food - the feeling of being thirsty is your body's way of telling you that it needs water.