Burl, congratulations on your second hip. Just keep plugging along and you will make it, I am sure.
Now on the Water Heater, are you sure you don't have a WH bypass. Your unit is a 05 and I was under the impression, (May be wrong) that bypass was standard. Anyway, if you want to fill with antifreeze, which is certainly an acceptable option, it is still necessary to pull the plug on the back of the Water Heater and drain the 6 gallons of water first, before you try to refill with antifreeze. Draining the lines and the fresh water tank should be done as well, to ensure you don't dilute the antifreeze with trapped water.
Just for the record, for those who may not have looked, what I call a WH bypass is a set of three valves directly on the back of the Water Heater. The middle valve handle should be in-line with the line and the other two turned across/against the line of flow of the water, to be in bypass mode. Easier to understand when seen, as opposed to reading about. When the handles on each valve are in line with the water line, water can flow through the line. The bypass allows you to cut off the flow to and from the water tank. I hope this helps anyone who is trying to winterize for the first time. All my earliest units did not have a bypass kit installed and Trail-lites come with it standard now. Just another example of the "little things" that come standard on our units.
PS: During the Summer the middle valve should be closed so water HAS to flow into the water heater tank around the heater tube and back out to the faucets. Hope that was clear.