There is hereby established in every school district a fund which shall be called the “food service fund,” which fund shall consist of all moneys deposited therein or transferred thereto according to law. All moneys received by the school district for food service and from charges for food service shall be credited to the food service fund. The expenses of a school district attributable to food service shall be paid from the food service fund. No moneys in the food service fund shall be transferred to any other fund of the district. Nonpublic schools shall maintain fund accounting of programs supported under this act.