Do you have patients with recurrent nephrolithiasis target a certain urine volume or rather consume fluids as needed for goal of having consistent clear urine?  

I think you could go either way. To prevent most types of kidney stones, 2L/day seems to be the minimum urine volume required. For cystine stone formers, I double that amount. My more compulsive patients like having a quantitative goal. The amount of fluid intake roughly equals the urine volume, abs...