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That’s the adjustment screw for the set screws in the rear dropout. Yours is obviously defective and we should trade bikes.
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The “water bottle” is an aero fairing and not actually meant to be used as a water bottle.
Whoa! I cant believe you would get a bike like that and not know what the adjuster thingees were, it was an integral part of the marketing material!!! With the exception of winning lotto or something, I wont be getting one, but the retention of the bottle is an issue in my opinion - it sounds as if it only happens when filled, which as it seems to be a fairing first and foremost is sorta ok, but what will happen if you chop the top or use the bento box version when filled with a couple of co2s, tube(? will it fit) etc. Will it be sufficiently heavy to also cause it to eject?
Good luck with the bike regardless, may your bike splits improve ![]()
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