Your boat has a raw water wash down system, this system is fed from water from the Starboard jet pump that goes up to a bulkhead mounted shut off valve. The line that carries this water makes a some circuitous turns through the aft bilge compartment up to the quick disconnect in the rear starboard area of your boat.
It would be a good idea to 1-check the bulk head valve to make sure it is in the on position. 2-blow this line out with some low pressure air, perhaps 20 psi to make sure there is not water in that line.
Your gas tank should be full when putting it into storage, if you need to fill it up you can add the fuel stabilizer BEFORE you put the gas in so it will mix up while you fill the tank. If non ethanol gasoline is available in your area use that fuel, your engines only require 86 octane fuel. Once the tank is full, take the boat home and get set up to run the engines on the hose.
Remember, start the engine first, then turn on the water. When shutting down an engine that is on the hose, turn the water off first, then turn off the engine. This keeps the water from flowing into an open exhaust valve when the engine is not running. Then blow the water out of the engine that was just running and repeat on the other engine. By doing this you will get the treated fuel up into the fuel system of each engine. I’d say running each motor on the hose for 6 minutes or so should do the trick.
You have removed all of the water that could pose a problem, and
@HangOutdoors suggestions are just about all of the rest.
FWIW, I use my boat into the colder times of the year, like when overnight lows are in the teens and daytime highs are in the 20’s and 30’s. I start running fuel stabilizer in my tank as the weather cools off heading into fall, so the gas is always treated. All I do when I pull the boat out is to blow the water locks (mufflers) out, make sure the clean out plugs are drained, the main plug is out and I leave the nose of the boat up as high as the jack will take it, and put the cover on it. Once the weather is too nasty or the water starts to turn to a solid, I pull the T top off and put it in my heated shop which is kept around 38-40* during winter. How far you go on “winterizing“ is a bit dependent on whether the boat is stored outdoors or is stored like my boat is.