Is Ultima really 0 calories?

I'm curious, is it really true that Ultima boasts 0 calories? I understand that many drinks claim to be calorie-free, but how can you be so sure that Ultima truly doesn't contain any calories at all? It's important for consumers to make informed decisions about their dietary choices, so I'm eager to hear the specifics behind this claim. Could you elaborate on the ingredients and manufacturing process that ensure Ultima remains calorie-free, and provide any evidence or testing that supports this assertion?