PepsiCo, the worldÔÇÖs second-largest drinks maker, has said it is buying its two top bottling firms for $7.8 billion. The deal with PepsiAmericas and Pepsi Bottling Co will enable PepsiCo, whose brands include Tropicana, Gatorade and Mountain Dew, to cut costs and boost its North American profits as sales of carbonated drinks continue to decline. PepsiCo has said that annual savings from the deal, which is expected to close later this year, are expected to reach $300 million by 2012.