One (1) or more waterworks or sewerage systems, owned by one (1) or more persons or corporations, may be acquired under authority of this part as a single enterprise, and the governing body of a city or town shall be and is empowered to enter into agreement with the owners as to the value of the waterworks or sewerage systems, and to purchase the waterworks or sewerage systems at an agreed price to be fixed by resolution passed by the governing body of the city or town upon three (3) separate readings on three (3) separate days. The city or town shall be understood to have all authority necessary to combine new works acquired under this part by purchase, construction or otherwise with any similar existing works owned by the city or town, all to be a part of the same single enterprise under the same supervision and control.