All is not lost. The first link is an attachment that goes onto you water pump and will draw rv anti freeze into your system. The second is a schrader valve that lets you pump pressurized air into your system.
Amazon.com: Camco 36543 Pump Converter Winterizing Kit: Automotive
You should be able to winterize using 1 or 2 gallons of the pink stuff. You do not put it in your fresh water tank as you have discovered. No real harm, flush the tank a few times and the pink stuff will be gone from the tank.
For the hot water system-You drain the hot water tank and then turn the hot water bypass valve on so that you are not filling the hot water tank with rv anti freeze. If there is pink stuff in the hot water tank then just rinse it out.
If you are really new to this then find a friend who can help you or pay for a service tech to teach you. It will be much cheaper than repairing busted lines in the spring.
Not knowing what type of water heater you have...most people replace the anode rod when winterizing.
You can also call Fleetwood owner relations to get the winterizing instructions. If you are really stuck send a pm and I will try to help.