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I haven't seen them lately but at one time if you bought a bottle of antifreeze there would be one of those adapters, You cut the heater hose near a high point and add it, after that you can hook your garden hose up to the heater core hose and it comes with a cap. Its there in the car forever more. part of the reason is to backflush but it also might help to fill the heater core.
you can let it run a while with the engine running and the rad cap off, that backflushes it well, fills the heater core up, then unhook the hose, drain some of it out from the lower rad hose and refill with fresh coolant.
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