Immediately after organization the commission shall proceed to negotiate for the purchase of the entire waterworks supplying water in the municipalities making the application for its appointment, and in the other municipalities, if any, supplied with water by said waterworks and may enter into a contract to purchase said waterworks for compensation to be agreed upon or fixed by condemnation proceedings as hereinafter provided. A copy of every contract to purchase said waterworks shall forthwith be served by the commission on each of the municipalities that made and joined in the application for the appointment of the commission and the contract shall become binding only as to such two or more of the municipalities that made the application for the appointment of the commission, and joined therein, as shall by resolution of their governing bodies file with the commission their assent thereto. Such assents shall be so filed within three months after the copies of the contract have been served on the municipalities by the commission, as hereinbefore provided.

In all applications, orders, reports and proceedings a general description of the property to be condemned shall be sufficient.