Phyllis,
Even though you didn't use the fresh water system, there probably is  water 
in the lines and pump. Pick up a gallon of nontoxic RV anti-refreeze at  
Walmart, a RV store or a marine store and add it to the water tank. Open the  faucet 
and run some through until the pink of the antifreeze shows up.
Another method I prefer is to put a couple of liters of Vodka in the water  
system and then add some orange juice in the spring.
The marine head or porta-potti also needs to be dealt with.
Spreaders should be fine. I don't know why the previous owner removed them.  
If you are going to top off the gas tanks, purchase some Sta=Bil (gasoline  
stabilizer) and add it to the gas. It prevents varnishing.
Check your motors owners manual on winterizing. Or, take it to a dealer to  
be winterized. My experience has been that if the motor has a thermostat, it  
must be removed to drain the water from the cooling jacket to prevent freezing  
and ruptures. 
 
Rummy