To preserve amla juice, ensure that the quantity of the juice is equal to the capacity of the jar. For instance, 500 grams of amla juice should be stored in a 500 grams capacity glass or a plastic container. Add 2 tablespoons of sodium lactate and mix well. This juice can be preserved in the refrigerator for 8 to 10 months. Sodium lactate is easily available at a chemist or any store that sells food chemicals.