Here is your manual I think:
https://www.airstream.com/wp-content...0110i.arc_.pdf
On p. 69 [PDF p. 75/100] the Water System section starts, with basic layouts on the next page, and electrical details further back. I don't see any plumbing diagrams, and recall that others have emailed Jackson Center and had plans sent back.
Try the Service tab here:
https://www.airstream.com/travel-trailers/
And then Contact Us, or AS's 800 number.
Gotta run . . . Good luck!
Peter
PS you could also post in the
Sovereign sub-forum for better advice, which you could find via the blue-bordered search box above.