CHICAGO — The company that added "venti" and "frappuccino" to American vocabularies is making a push throughout North America to persuade connoisseurs to sample what many see as a down-market drink — instant coffee.

Nearly eight months after Starbucks Corp. began selling its Via instant coffee in Seattle and Chicago, the company today will begin offering the dissolvable drink to the rest of the country and in its Canadian stores.

Backed by the company's first-ever television ads, along with large-scale distribution to about 1,500 sites outside its stores, the Via launch shows just how determined Starbucks is to own a stake in the $21 billion worldwide instant coffee market.

"Based on the success we've had, we feel strongly that we're sitting on a very big opportunity," Starbucks CEO Howard Schultz said during a conference call with journalists. "What's going to sell Via at the end of the day is that (it) delivers in the cup. Most people will not be able to tell the difference."

While instant coffee is pervasive throughout Europe — accounting for as much as 80 percent of coffee sales in the U.K. — the insta-brews haven't won over American taste buds, in large part because of their image as an inferior knock-off of drip-brewed beverages.

But it's that perception that Starbucks executives are trying to change. They hope the skinny cylindrical 3-packs ($2.95) and 12-packs ($9.95) of coffee that dissolve in water will eventually be as prevalent on store shelves as its packaged coffee is now. The coffee is available in Colombia and Italian Roast flavors, and more varieties are expected to be introduced in the future.

While experts see opportunity for Starbucks, they also see challenges.

Bob Goldin, an analyst at the Chicago-based food consultant Technomic Inc., said Starbucks faces twin hurdles of perception and price. The Starbucks instant comes in just shy of a dollar a cup, compared with the pennies it costs for a cup of home-brewed joe.

Marshaling vendors like camping store chain REI and office supply chain Office Depot Inc. will help the company get the product in hands of new customers. Via also will be sold inside Costco Wholesale Corp. and Target Corp. stores and to big food vendors like Compass and Aramark.

The offensive is also taking to the air, where passengers onboard certain United flights today will be able to sample the drinks. In late October, United travelers will be able to buy 3-packs of the coffee from flight attendants while cruising at 30,000 feet. Vendors will be able to set their own prices for Via, but the company recommends similar prices to what the product will be sold for in Starbucks stores.

Next year, Via will appear on grocery store shelves, which along with bulk stores account for roughly two-thirds of Starbucks' packaged coffee sales.

Executives wouldn't release data on how Via's performed during its eight months on the market, but said early sales in the two U.S. cities — as well as in London — have exceeded expectations.

Among the surprises so far are the various uses of the drink discovered by consumers, executives said. Some people are buying the ground coffee to cook and bake with, while others are mixing it with cold water or milk. Schultz said it's also being bought by teachers to keep in lunchrooms and desks and by physicians who want a quick cup of coffee in a hospital.

The introduction of Via comes at a particularly trying time for Starbucks, which has seen its revenue slide for the past three consecutive quarters. Meanwhile, profits have fallen in five out of the past six quarters.

Hit by increasing competition and a recession that's caused caffeine addicts to switch to cheaper drinks, the gourmet chain's also had to close hundreds of stores and lay off workers as it tries to regain its financial swagger.

Whether or not Via will be a home run remains to be seen, particularly as competitor Nestle SA ramps up marketing of its own single-serve instant Nescafe coffee.

Goldin said the product will need more widespread sales than vendors such as Office Depot, REI and United can offer. If Starbucks can get Via in front of enough consumers, then it could have a chance for the beverage to succeed.

"They're trying to find a breakthrough and I give them credit for that," he said. "But it's easier said than done. I think they're going to have some challenges."