Mountain Dew will launch a lemon-lime soda called Mtn Dew Ice, on Monday, PepsiCo announced. The new drink treads on Coca-Cola’s turf with Sprite and Dr Pepper Snapple Group's 7Up. Like Sprite and 7Up, Mtn Dew Ice is clear. There's one key difference, though. Mountain Dew's version has caffeine, an ingredient found in colas but mostly missing from the lemon-lime category.