You'd want a fit girl, I imagine. One who goes on all that yoga and fruit and namaste etc. stuff.
A diet primarily of fruit, and who hydrates seriously.
Just logically presuming that what goes in affects what comes out. If she drinks plenty and sustains herself on plenty of natural sugars and vitamins, it'll probably taste better than the urine of a heavy smoker/drinker who lives off of doritos and happy meals.
WE MUST CONDUCT A STUDY.
please