The corporate authorities of a school district may take any action that may be necessary to inform the owners of unpaid bonds regarding the financial condition of the school district, the necessity of refunding its unpaid bonds and readjusting the maturities thereof in order that sufficient taxes may be collected to take care of these bonds, and thus re-establish the credit of the school district. The corporate authorities may enter into any agreement required to prepare and carry out any refunding plan and, without any previous appropriation therefor under any budget law, may incur and pay expenditures that may be necessary in order to accomplish the refunding of the bonds of the school district.