They actually make pumps that run off of power tool batteries. No rigging required. E.g. RYOBI One+ 18V Hybrid Transfer Pump P750 They also make battery-to-12V

They actually make pumps that run off of power tool batteries. No rigging required. E.g. RYOBI One+ 18V Hybrid Transfer Pump P750 They also make battery-to-12VDC adapters, and there are plenty of 12v barrel jack fountain pumps. Don't even have to break out the soldering iron!