If you're thirsting for a cheap stock that's poised for growth, here are three reasons to buy SodaStream International (Nasdaq: SODA).

Cheap, green, and easy: SodaStream's DIY carbonated-drink makers can take a heck of a lot of waste out of our shared space. SodaStream says it offers an "Active Green" product, meaning that consumers can actively reduce their carbon footprints every time they use its machines to make soda or sparkling water at home.

Although Americans are getting better about recycling than decades ago, we still have a lot of room for improvement; plenty of recoverable refuse like plastic bottles still ends up in landfills. According to the EPA, in 2010 Americans managed an overall 34.1% recycling rate, but only 13% of plastic bottles (like those ubiquitous plastic water and soda bottles) were recycled. SodaStream's product takes the cases of containers out of the equation.

SodaStream boasts that consumers no longer have to lug heavy bottles and cans from the store or separate the empties for recycling, and its machine doesn't use batteries, plumbing, or electricity. SodaStream also pitches that its users only pay about a quarter for the equivalent of one can of soda or one liter of sparkling water.

Sparkling sass: It takes a pretty spunky company to take on beverage giants like Coca-Cola (NYSE: KO) and Pepsi (NYSE: PEP). In fact, SodaStream's setting its competitive sights on such companies with its marketing campaign, "The Cage," which is set up in 30 displays worldwide. "The Cage" is filled with bottles and cans picked out of trash sites, and its banner reads: "1 Family. 5 Years. 10,657 Bottles and Cans."

Coke, for one, wants out of "The Cage" and has threatened SodaStream with legal action in an attempt to get the company to stop using Coke's bottles in its marketing. This adds up to an interesting argument, since somebody went dumpster diving to retrieve consumers' throwaways. At some point, trash is trash, whether it ends up in a landfill or reused in a thought-provoking campaign.

A refreshing bargain: SodaStream shares are currently very undervalued. SodaStream trades at 14 times forward earnings. Coke trades at 18 times forward earnings, and Pepsi has a forward price-to-earnings ratio of 16. Dr. Pepper Snapple (NYSE: DPS) trades at forward 14 times earnings. Then there's Monster Beverage (Nasdaq: MNST), with its monstrous forward P/E of 29.

SodaStream trades at a lower forward price-to-earnings ratio than those other beverage companies, and it has a better shot at much larger growth since the U.S. market is a big one to tap. Along those lines, SodaStream's PEG ratio of 0.58 signals an extremely undervalued stock compared to growth expectations.

I recently called out three reasons to sell Monster, and bought shares of SodaStream for the real-money portfolio I'm managing for Fool.com. A company that's willing to aggressively take on the likes of Coke -- and point out how it can save consumers money, energy, and needless waste -- shows some great indicators of potential growth in a changing world. SodaStream looks like it can add some sparkle to any portfolio.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.