We have a utility sink in the laundry room with a Python adapter on the faucet. Since that sink is pretty far from the farthest tank location, we have an in-line pump to speed up the draining (the tank below is the closest). Pump is in a plug that has a wireless remote. When I'm ready to fill, I just hit the remote, turn off the ball valve at the faucet end, open the Python adapter, and start running the water to get the temperature right. Then open the ball valve and close the adapter to start the fill.
We have nice, clean rocky mountain water with <50 TDS out of the tap, so no real need for RO. Prime right into the tank during the fill.
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View attachment 1032866