Bottle Cap as Pill Cup

I need to take lots of Tums every day, for the calcium. I take 3 of the original ones before each meal, and 3 before bedtime. At the appropriate times, I dump three into a largish pill bottle cap and set it next to my keyboard (or wherever I happen to be working at the time). I reach for them without thinking about it as I work, and when I reach and find an empty cap, I know I've had that dose of Tums.