Best results are obtained if the condensed milk is used at room temperature, and on the day it is freshly made. However, any extra can be stored. Store the unused sugar free sweetened condensed coconut milk in an airtight container that can go from cold to hot. The content will keep in the refrigerator for one to two weeks. Note that the homemade condensed milk will harden, especially if stored in the refrigerator. To reliquify, boil some water in a small and deep sauce pan. Remove the sauce pan from heat and place the container of the condensed milk into the hot water. Stir occasionally as the solid is turning back into a liquid. Stirring is important in order that all the ingredients stay emulsified. When the condensed milk has almost completely become fluid, remove the container from the water and stir to combine. Use at room temperature. CAUTION: Heating directly in a pot or in a microwave will change the taste and/or the texture.