Mich. Comp. Laws § 123.153

Sec. 3. Such cities shall have authority in their joint names to purchase and condemn property necessary for such source of supply, and for such purpose may bring proceedings under Act No. 149 of the Public Acts of 1911, as amended, or under any other general law of the state applicable to the condemnation of property for city purposes. Contracts for the construction of such source of supply may either be entered into individually by such cities, or in whole or in part by joint contract or contracts to which all or any of the cities are parties.