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Fairly dumb answer, it doesn't really matter. If it's dark you should try to drink more water. It should be light enough that it doesn't really effect the water in the toilet bowl much at all.
Why though? The water should dilute it more and change the color, especially with some american toilet bowls, because some water levels are insane.
I guess if it's a huge amount of water you could not notice the color. If it's clear then it's clear though. If it's not, you'll probably notice either place unless it's a something crazy. I guess just look at the stream if that's your position.