Any municipality or municipalities issuing revenue bonds under the provisions of this article shall install and maintain a proper system of accounting, showing the amount of revenues received and the application of the same, and the governing body or bodies shall, at least once a year, cause such accounts to be properly audited by a competent Auditor, and the report of such Auditor shall be open for inspection at all proper times to any taxpayer or resident of said municipality or municipalities, or person receiving service from said works, or any holder of bonds issued under the provisions of this article, or anyone acting for and in behalf of such taxpayer, resident, person or bondholder. The treasurer of such municipality or each such municipality, or other official or institution specifically charged with the duty, shall be the custodian or custodians of the funds derived from income received from said works, and shall give proper bond or bonds for the faithful discharge of his or its or their duties as such custodian or custodians, which bond or bonds shall be fixed and approved by the governing body or bodies. All of the funds received as income from said works under the provisions of this article and all funds received from the sale of revenue bonds issued therefor shall be kept separate and apart from other funds of the municipality or municipalities, and separate accounts shall be maintained for the several items required to be set up by the provisions of section seventeen of this article.