Hi,
I would recommend you to create document type which is only a container, as FroggEye mentioned. Then in query data source web part, select this document type and put there a query. It could look like this:
SELECT [ContactUsID]
,[FormInserted]
,[FormUpdated]
,[FirstName]
,[LastName]
,[Email]
,[PhoneNumber]
,[Message]
FROM [KenticoCMS_7_zero].[dbo].[Form_ContactUs]
Then open the properties of basic repeater web part and simply put something like this to the transformation:
<%# Eval("FirstName") %>
I hope this helps.
Best Regards,
Roman Konicek