You said your parked up hill. If you have a 1/4 tank of fuel or less and the shower head pickup is disintegrated or fell off you won't be sucking fuel, just air. If that's the case, add another 5 or more gallons of fuel. Shower head pic below. There cheap from ebay, dealer is always more expensive.
On possible water in the cylinders. There is a drain hole in the bottom of the air filter, if the filter element is soaked with water, then it's possible to have water in a cylinder or two. Since you have cranked it over and it won't start then you have a fuel suction problem, "NO fuel out the schrader valve", if it ran before, your problem is like above.