Suzuki marauder VZ800 question

I need to drain the carbs before I go back to school. I've found the one just in front of the battery... the other one appears to be forward of that one under th gas tank wedged above the rear piston. Can anyone confirm that that's what I'm looking at. Also, what's the easiest way to drain it? If you can photograph or exactly describe the screw I need to undo, that would help a ton. If I drain the rear one will the forward one drain down through it or do I have to drain both? Is that even possible without removing the gas tank?

Thanks in advance.