The sentence means "Where do you buy food for your family?". The answer would depend on you particular buying preference. "Compro la comida en el mercado en la esquina." (I buy food at the corner market).
I think you mean Donde which is Where (in english)
where is my husband
'unn' - ?'donde vives' = where (do) you live
The nearest airport to travel to this destination is located where?