1. In a medium bowl, combine the coconut milk, sweetener, chia seeds, and vanilla extract.
2. Stir well to ensure the chia seeds are evenly distributed.
3. Cover the bowl and refrigerate overnight, or for at least 4 hours. This allows the chia seeds to absorb the liquid and form a thick, pudding-like consistency.
4. In a blender, combine the diced mango, water, and sweetener. Blend until smooth.
5. Taste the puree and adjust the sweetness if needed, adding a bit more sweetener if you prefer.
6. In serving glasses or bowls, layer the chilled chia pudding with the mango puree.
7. Top with sliced banana and slivered almonds for an extra crunch and flavor.