If there is Ethanol, it would appear that there is more water than when you started.
I use the often suggested olive jar (tall and narrow) with one line marked on it about 20% up from the bottom. I carry it with me to the gas station prefilled with water to the line. simple enough to fill close to the top, cap and shake. Later i seperate out the water with a Mr Funnel and use the gas for my lawnmower.
-- Paul S