Despite the water&rsquo;s yellowish color, Mari Carla Ram&iacute;rez and her brother, Carlos Jovan Rodr&iacute;guez Reyes, marvel at the scarce resource being delivered to their house by a city water truck. The children live in Campamento 26 de Julio, a marginal area on the outskirts of Iztapalapa, one of Mexico City&rsquo;s largest and most crowded boroughs. In Iztapalapa residents complain that they receive tamarind-colored water from the trucks. Residents of Campamenteo 25 are among thousands in Iztapalapa who battle with water shortages and poor water quality. Drinking water must be bought separately, in large plastic jugs called garrafones.