https://www.faa.gov/air_traffic/publ..._documents.pdf
The link above gives you an example of The General Declaration Forms
Which should detail the Crew Names and you sign to declare that no pax or crew on flight might have symptoms of a possible commucible disease or not as the case may be. It also asks about details of insecticide spraying carried out during the flight etc.
The completed gen dec, probably required in triplicate plus pax manifest should suffice.