Except for money received for a cafeteria or for an activity fund, all money for public school purposes distributed to a school district, or collected by a county, school district or public school authorities for a school district, shall be delivered to and kept by a county treasurer or a board of finance of a school district in funds approved by the division. Disbursements from these funds shall only be made for matured debts by voucher and warrants or checks of the local school board. In no event shall any money be expended or debts incurred except as authorized by the Public School Finance Act. Money for a cafeteria or for an activity fund shall be deposited in a bank, or in a savings and loan association whose deposits are insured by an agency of the United States, or may be deposited in a credit union, as long as the credit union deposit is insured by an agency of the United States, approved by the local school board. The local school board may deposit any cafeteria funds, any activity funds or any other funds in one or more accounts with any such bank or insured savings and loan association in its county, but no local school board, in any official capacity, shall deposit any cafeteria funds, any activity funds or any other funds in any one such savings and loan association the aggregate of which would exceed the amount of federal savings and loan insurance corporation insurance for a single public account. As used in this section, “deposit” includes share, share certificate and share draft.