I did not like having to put antifreeze in the system, so when I built my Lil Hauley I positioned the water components for easy draining. I also remove and drain the sink trap. The shower has a bladder trap and doesn't need draining. I blow the lines out thru the city water inlet to finish draining. Only use antifreeze where necessary and don't leave it in your water heater if you don't use it, as it will go rancid.
Your heirs will inherit money and stuff when you are gone. You can only save or spend money, but you can do things with stuff, so they are going to inherit stuff!