Brazil's largest city is facing a water crisis just a month before the start of the football World Cup.<br /><br />Low rainfall this year means water may have to be rationed in Sao Paulo, which will host the first game of the tournament.<br /><br />Experts say the city's main reservoir holds a fraction of the water it could potentially hold and warn it may take 20 years before water levels recover.<br /><br />Al Jazeera's Gabriel Elizondo reports from Vargem near Sao Paulo.
