I think all patients at the very first sign of kidney problems be told how important drinking water & making changes in their diet so the kidney disease doesn't progress.  I really like my primary dr ,but , feel  she have explained  more when my blood work showed I was starting to have a problem with my kidneys.  My husband's dr put in his after visit notes!! He was already stage 3.  I didn't look at the notes for a couple months!! We changed primary doctors!!  Think ALL patients needed to know as soon as their kidneys become even the slightest problem!!!! 
Aurora 2285 Sequoia Neph