The cotinine test is just to test for nicotene use so that should be no big deal unless you are a heavy tabacco smoker.
1: Stop drinking lots of water now. Just drink a normal amount. I would drink about 28 ounces of gatorade the morning of the UA. Pickup some creatine supplements at walmart.Thy're cheap. Take some B complex vitamins the morning of the UA. Be careeful to not take too much. You might want to experiment with the B complex abd see how much it takes to color your urine.
2:They test for creatine levels which is why you either take some craetine or load up on red meat 3 or 4 days before the UA.
3: Yes fat and red meat.
4:B complex. I'd experiment with it today to see how much just lightly colors your urine.
5:Yep just exercise and a high fiber diet with metamucil. Stop exercising 2 or 3 days before your nest UA and switch to fat again.