had to add a little distilled water - should I worry?

Hi,
I browsed these boards last night, and they are brilliant. I had a pre-employment drug test at a LabCorp this morning. Using info gleaned from these boards, I got my substituted clean sample accepted with a smile, temperature ok, signed off and hopefully that will be me enjoying my new job next week.
Just one thing I am worried about is that the sample my clean friend gave me was only about 55-60ml. As I was leaving home, I panicked that it wasn't going to be enough, so I added about 10ml of distilled water to it. Will I get away with that?
Results are sent direct to employer. If there is a problem, how long do you think it might be before I hear about it? Is no news = good news?

Usually no news is good news but you are running the risk that you dilluted your sample by adding the water. If the lab confirms that then you may be asked to give another sample or your employer could take you dilluted sample as a fail. If you have not heard anything by now, call your employer to confirm your start date and under no circumstances mention the drug test.