In general, there is no such thing as "Zero Calories", either!
The energy of water is 1,000 calories, or 1kCal. How a soda can be less than the equivalent of water sound illogical, AND, when they advertise calories in the states, they don't put the little 'k' in with it, despite all calories are measured in 'kCals'!
taking at least one Creon with the amount of soda probably won't hurt, but DEFINITELY take in MORE CALCIUM!!
The soda burns up the calcium, and with the malabsorption problem we already have, replacing the calcium is vital!
I take calcium before bedtime, which I heard was actually the best time. However, don't take too much calcium (maybe for women, too much is not likely), because too much causes a few disorders, such as quick temper--there was another one, but forgot (hopefully senility is NOT the other one! hehe!).