Hi I am Winnie from Zimbabwe

how best can i design are health questionnaire for visitors and subcontractors so that they would fill in before they enter into the packhouse if anyone as a sample please share so that i can get a better picture of it

I would have it as part of your visitor sign-in policy. Make sure everyone reads it and signs it before entering. Some places require that visitors watch a short video before entering. The video would talk about things like the health policy.

Not sure if this is exactly what your looking for but I've attached a generic one where the health portion is part of the sign-in sheet.