See the sticky thread above titled dilution. Tells you all you need to know.

Next time I would suggest being better prepared. I practiced several times using heating pads, the type used to warm your hands during outdoor sporting events or the like. Its takes two strapped on my piss bag, then place on my inner thigh and then wrapped up in a Ace bandage. This keeps my piss at 99 to 101 degrees for three hours. I take a little digital temp probe and cool it down if I have to. You can always cool it down, but heating it up is impossible. And I just blow on it and swish it around in the cup if the temp is on the high end.

As to whether you will be observed, I am no expert. But I believe they are allowed to observe on the second test in your case. Whether they will or not I have no ideal. But they can.

If you are going to dilute, eat plenty of red meat to raise your creatine (sp?) and drink some soda or coffee to give your piss some color prior to giving piss.

Like I said, I am no expert and I highly recommend reading the thread I mentioned earlier.