Hi, Kelly! We are excited for your visit! We do not have water or electricity anywhere in our park. So, no, there isn't a potable water spigot available.
However, we've created an interactive map with local resources:
https://cpw.state.co.us/placestogo/parks/ArkansasHeadwatersRecreationArea/Pages/MapsDirections.aspx
Click on the broken square at the top right, then select the Camper Utilities (local resources) layer to view and get directions to some local businesses that offer this type of service.
Please remember to call and check on availability this year, as some locations have limited services due to COVID.
Have a great trip!