PepsiCo Inc. agreed to buy fizzy-drinks dispenser SodaStream International Ltd. for $3.2 billion to extend the company synonymous with sugary sodas into the homes of more health-conscious consumers. PepsiCo will pay $144 a share in cash for the Israeli company, the companies said in a statement Monday. That’s 11 percent higher than Friday’s closing price and would be the Purchase, New York-based company’s largest acquisition in eight years. In one of her final acts as chief executive officer of PepsiCo, Indra Nooyi is betting on a razors-and-blades kind of business model to reanimate revenue growth that has been waning due to weak demand for traditional sugary soft drinks.