I have never put pink stuff in my FW tank or water heater. That's completely pointless and a waste of time and antifreeze along with a hassle of getting the pink stuff out come spring. I live in pretty well the coldest civilized part of Canada and I have never had any issues with anything freezing up.
You need a way to hook a container of anti-freeze to the suction side of your pump. Mine has a built in anti-freeze inlet where I just need to open one valve and close another but you may need to unhook the pipe from the suction side of the pump.
It should only 2 or 3 gallons of anti-freeze max and that includes dumping it in the p-traps and toilet.