ORS § 169.220
All persons lawfully confined in a county local correctional facility, or as prisoners engaged in work under the custody and jurisdiction of a county, shall be fed and maintained at actual cost to the county. All persons confined in a county local correctional facility shall be given three meals per day. An accurate account of each meal furnished to others than adults in custody of local correctional facilities, together with the names of the recipients thereof, whether facility employees or otherwise, shall be kept and reported by the sheriff each month to the county court or board of county commissioners. The county court or board of county commissioners shall furnish the sheriff with adequate equipment and supplies for carrying out the provisions of this section. The sheriff has authority to employ such assistance therefor as may be necessary. All supplies and equipment needed to feed and maintain such persons as provided in this section shall be purchased by the county court or board of county commissioners upon requisitions duly verified and presented by the sheriff to the county court or board of county commissioners. All supplies so purchased shall be paid for by warrant drawn upon the general fund of the county, upon presentation of vouchers containing itemized statements of all supplies so furnished, duly verified by the sheriff and by the person selling the same, each of whom shall certify that the supplies were actually furnished and received in the quantities represented and were of good quality, and that the price charged therefor was reasonable and just.
ORS 169.220