What are the details of the infrastructure maintenance plans for the next 10 to 15 years to ensure a reduction in non-revenue water for (a) Makana in the Eastern Cape, (b) Ndwedwe in KwaZulu-Natal, (c) Letsemeng in the Free State, (d) Knysna in the Western Cape, (e) Nama Khoi in the Northern Cape, (f) Moses Kotane in the North West, (g) Emfuleni in Gauteng, (h) Polokwane in Limpopo and (i) Emalahleni in Mpumalanga local municipalities?