You can use any kind of dairy-free milks, keeping in mind that the ones with stronger flavours such as almond might alter the taste of this date caramel. Personally I prefer to use a more neutral dairy alternative such as oat milk.
Make sure the dates you are using are moist. If they are too dry make sure you soak them in warm water first to soften them.
When done, store this date caramel sauce in an airtight container in the fridge.