Pepsi Cherry Vanilla

CARBONATED WATER, HIGH FRUCTOSE CORN SYRUP, CARAMEL COLOR, NATURAL FLAVOR, PHOSPHORIC ACID, POTASSIUM SORBATE (PRESERVES FRESHNESS), POTASSIUM CITRATE, CITRIC ACID, CAFFEINE, CALCIUM DISODIUM EDTA (TO PROTECT FLAVOR), VANILLA EXTRACT

No sugar at all, even Pepsi Wild Cherry has some sugar in it, after caramel color, unless they are cutting costs.

Why the need for Potassium Sorbate, Potassium Citrate and Calcium Disodium EDTA?