Combine oats, almond milk, chia seeds, maple syrup, cinnamon and water together in a large tupperware container. Stir well to mix. Seal and place in the fridge overnight (or for at least 8 hours).
Remove oats from fridge. Use single-serving size mason jars and place a large spoonful of the oat mix in the bottom of each, then a layer of blueberries followed by a layer of slivered almonds. Repeat until all ingredients are used up. Store in the fridge until ready to eat. Enjoy hot or cold!