They don't "watch you pee" LOL. They do give you a basket in which you must empty the contents of your pockets. The "restroom" is actually 2 rooms.
The "tester" is in the 1st of the adjoining rooms & will give you a cup which you must fill to a certain level & instruct you not to flush (they can hear you).
There is no sink in the 2nd room with the facilities, but there is one in the room with the tester which you are free to use once you return with the sample.
You then sign a form (you get a carbon copy) & intial 2 stickers which are used to seal your "split" samples.
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The water is obviously to help you be ready to "produce" when they hand you the cup. Otherwise, you will have to just wait at the office, drinking water, till it "filters" down and you can get them a sample. They won't let you leave to come back some other time.
As for the "Subscribe" button, that sends yo email of any replies. No need to "subscribe" unless you are really interested in the answers. You can always just re-visit the topic! That's all I do.