PepsiCo will buy the Israel-based DIY soft drink company SodaStream in a deal worth $US3.2 billion ($4.4 billion). The move is widely seen as an effort by Pepsi to prop up its catalogue of “healthy” food and drink options as it continues to wage battle against longtime rival Coca-Cola. Both PepsiCo and Coca-Cola have invested heavily in both healthier and eco-friendly alternatives over the past decade.