Flavoured coffees (kcups) are not a problem , it's an essence there's no carbs or sugar. That said, some kcups do have carbs and sugar. Like cappuccino, latte, hot chocolate, and I used to be addicted to the caramel cider.
Now to replace my cider urges, when I'm in the US I buy no calorie Apple drink mix, dilute double strength and put in fridge. When I want a caramel cider, I fill half a mug, fill the rest with water, add a shot of caramel da Vinci syrup, and heat up! Gives the same taste without the carbs