I just did it last week. Just drink what you would normally and if you fill it or not either is okay. I have to do it again though because the lab didn't do all the tests they were supposed to.

I had to do it twice

No just urinate as you would and fill the bottle it doesn't have to be completely full although there were times in was thinking... What if I do lol 😁

Meee I have had to do it twice....it's a pain in the butt😩