Awordaboutwaterquality关于水质：
IntheUnitedStates,lukewarmtapwaterfrommunicipalwatersystemsorintactwellsdeeperthan40feetisconsideredsafeforsalinesolutionpreparation.Ifthesecriteriaarenotmetorifwatersafetyisindoubt,distilledwaterortapwaterboiledandthencooledtoroomtemperatureisre