Lesson #1: Don't buy diet drinks of pizza day.
A few of us were still thirsty, so we walked over to the local 7-Eleven. I forgot my mug, and in the process got a lesson in soft drink mathematics.
I thought I'd be good and just buy a 20 ounce bottle of Pepsi. That was listed at $1.59. Below it was a sign for two 2-liters of any Pepsi product for $3. Now that math is easy. I could get 40 ounces of Pepsi for $3.18, or get 135.25 ounces (4 liters) for $3.
So I bought two bottles promising my coworkers that I would not drink it all today.
Then when I got back to the office, I had to wonder if I made out better than when I use the Extreme Gulp.
WARNING: MATH CONTENT
The two 2-liters of Pepsi actually ended up costing $3.46 with California Redemption Value (CRV). That's 2.55¢ per ounce.
The 52-ounce mug is $1.09 to refill; no tax and no CRV. That's 2.10¢ per ounce.
Of course if I have my Ultimate Gulp which is 68 ounces that drops to 1.60¢.
But thankfully, I balance this with at least 3 liters of water a day.