Wall power for PivotPi



I got pivotPi for a grovePi project because I needed a servo. The project is not mobile, so a wall power is sufficient. GrovePi is connected to power through raspberry Pi which is connected to wall power with a power adapter. I would prefer not to have to change or recharge batteries for PivotPi. I would like to onnect PivotPi to a wall power independently, or better yet somehow share power with raspberry Pi’s power.
Does anyone know what options I have?