Write a letter to a state agency, like the DMV, or voter registration, that will require an answer from them. A copy of the deed or most recent property tax statement is required for verification.Fill out an official affidavit form and sign it in the presence of a notary. Don't have utility bills? You could probably have your landlord notarize and sign something that affirms you were living in the apartment for 12 full months. Your proof of residency documents must be printed. Individuals who are unable to provide two acceptable documents may be eligible to complete a Texas Residency Affidavit.