This is my version of what is "good to the last drop".
It started as a way to get me to drink the water here. It just tasted old. And buying bottled water was getting old too. I can't stand it when my family leaves half opened water bottles all over the house and then not claiming them. It's so much waste.
tall glass of ice water
juice of one lime
5-6 drops of vanilla stevia
I go through as silly amount of limes but now I can't get enough water or the last drops.