Consider connecting an RV water pump to dump cap with a hose connection. Route a small water line to T at the inlet to your toilet, install one on/off valve in the house water line ahead of the T and another in the grey water line. Then connect the 12 volt electrical to a switch near the toilet. Open the grey water dump valve, position the valves so the house water is off and the grey water is open, turn on the pump and flush away.
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