Drinking more water != Darker line != More clean

A line is a line. Don't get wrapped up in the intensity of the line.

If you have been clean for a couple of months and can pass on your first void of the day, you have nothing to worry about.

As for exercise, fat burning exercise releases the THCA stored in your fat into your blood stream where it is either filtered by the liver or kidneys and purged from the body in stool or urine. Eating fatty foods and stopping all exercise 3 days before the test assures the THCA is no longer being burned and released into the blood stream and camping back out in your fat stores. You want to get out as much as you can while you can and then stop 3 days before and go into couch potato mode.