Dont wast coffee

I just wanted to share how I make sure I dont waste any coffee. In the morning I make the same cup every morning with 1 cup milk, 1/3 cup water, 1 spoonful of coffee and 1 spoonful of sugar. I keep 1/3 cup of the coffee in the fridge and use that 1/3 cup for the next cup. I then just add 1/3 cup milk, 1 spoonful of coffee and 1 spoonful of sugar. The only thing that changes is that i then have 2/3 cup of milk. I keep on using the leftover 1/3 cup coffee from the previous cup in the fridge for the next cup so that I dont waste any coffee. I make my last cup of coffee just with leftover coffee and add a little milk and 1 spoonful of sugar. This way I dont waste any coffee at all.