The method comprises the steps or stages of (i) dissolving a coca leaf extract in water at a ratio of between 1:8 and 1:1,2 ; (ii) leaving resulting solution to stand; (iii) decanting the supernatant with a siphon; (iv) dissolving a product having sweetening properties in water; (v) adding the supernatant from step (iii) to the liquid from step (iv); (vi) adding citric acid; (vii) adding lemon oil which has been diluted in drinkable alcohol; and viii) mixing everything until complete dissolution with water until a desired level of Brix degrees are obtained.
