I know I didn't answer you yet, I wanted to find out how much this "I drink a lot of water" was.

It's not a matter of taking the home test when you think you are going to take the actual test. Since you can't consume liquids while you're asleep, by using the first void it gives an accurate test on a concentrated sample. If you take it later in the day it may be affected by fluid consumption during the day. 80-96 ounces of water during the day is nothing out of the ordinary. You probably will pass the real test but since you didn't use the first void, there's always the possiblity that you may have a problem. Normally 99% of people who pass the home test pass but I would give you a 90 because you used the evening sample.