You will need to provide more information because your question is a little bit ambiguous.
There are many types of "government documents". What is the document you need to cite?
If you are asking about which Zotero document type (report, journal article, etc.) to use so that it can be properly entered into Zotero to be rendered with a citation style, it is all the more important to say more about the document(s) you need to reference.
If you are asking about something else: You will need to provide more information about the citation style you are required to use for your assignment. Is this style required for all classes at your school? Are you asking which existing style is a match to your needs?
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There are many types of "government documents". What is the document you need to cite?
If you are asking about which Zotero document type (report, journal article, etc.) to use so that it can be properly entered into Zotero to be rendered with a citation style, it is all the more important to say more about the document(s) you need to reference.
If you are asking about something else: You will need to provide more information about the citation style you are required to use for your assignment. Is this style required for all classes at your school? Are you asking which existing style is a match to your needs?