N.J. Stat. Ann. § 40A:14-81.5

The governing body of any fire district may, by resolution, provide for and authorize payment of advances to officers and employees of the fire district toward their expenses for authorized official travel and expenses incident thereto. The resolution shall provide for the verification and adjustment of the expenses and advances and the repayment of any excess advance by means of a detailed bill of items or demand and certification or affidavit in the same form as required by a local unit pursuant to N.J.S. 40A:5-6 which shall be submitted within 10 days after the completion of the travel for which an advance was made.