"We make regular coffee, lattes and ice coffees right at home ... no need to run to a coffee shop," wrote one reviewer.

As leading coffee-producing countries struggle to grow crops in drier, less reliable weather, prices have soared to the highest in decades and the industry is scrambling for solutions.

I’m next in line. Today, I’m feeling a vanilla crème Frappuccino with three pumps of caramel syrup, a drizzle of caramel on ...