Which Bottle Is Mine?

As my family resides in my apartment this week, we have managed to drink lots of bottled water. Having bought a case from Costco, this inevitably leads to plenty of identical-looking bottles strewn about the apartment. With a sister who is germy and sick, this poses a problem unless we go through the trouble of labeling each bottle as we drink.

I thought to myself about how, at McDonald's, they have those little bubbles on the lids that let you mark Diet Coke vs. Coke vs. Root Beer vs. Other. I thought that this would make a perfect addition to today's water bottles. Add a row of fifteen or so bubbles with different letters on them, and each person can then mark their bottle with a unique identifying combination to make identifying bottles easier.