The Roam water bottle is like a personal SodaStream you can carry in your hand, and the company is developing flavored CO2 that tastes so good.

PepsiCo's SodaStream has attracted consumers for years in many European countries, such as Germany, where it introduced Mountain Dew- and Pepsi Max-flavored syrups for its machines earlier this year.

PepsiCo's SodaStream test flavors include Pepsi Homemade, Pepsi Homemade Vanilla, Pepsi Homemade Wild Cherry, Sierra Mist Homemade, Sierra Mist Homemade Peach and Sierra Mist Homemade Cranberry.