thinking about attempting.
There is nothing I know of that would prevent a hose from being inserted in the gas tank filler tube and siphoning gas out that way. However, my knowledge is not based on direct experience from trying to do this and succeeding. It is simply not seeing anything in the parts drawings that show any obstruction.
If you have sufficent reason to believe there is water in the tank you have several other options open to you.
Remove the fuel pump and remove the water through this opening that is quite large and enough so so you can see down in the tank. With a siphon hose you can move it around and siphon up the globules of water, along with any trash/debris. The car (tank) has to be higher than the other end of the siphon hose and of course there is the risk of gasoline fumes from the open tank or from the catch can igniting from a static spark or open flame (gas water heater in the garage).
Another way is to leave the fuel filter line disconnected from the filter and routed (maybe with a hose extender) to a catch can and using a fuel pump relay bypass with the ignition key trigger the fuel pump to come on and let it pump out gas along with any water.
Or if the water is not that bad using a gasoline additive that is intended to address water in the gas tank. However, you may find after running a tank of gas through with this additive in the tank you may have to replace the fuel filter again. It might be just a good thing to do regardless of any symptoms suggesting it needs to be done.
My preference is the additive technique. My second would be running the fuel pump to evacuate the tank at least until the water is removed.
My next to last preference would be to try siphon the fuel out along with the water, but you're doing this blind and you do not know if the siphon hose intake end is anywhere near the water or even on the bottom of the tank.
Last way would be to open the tank by removing the fuel pump.
Sincerely,
MarcW.