[NicknamedBob]

"The best price at Walmart for a 4 pack of Monster is like $6. So that is roughly $3/liter. If I can make 12 liters for $1/liter, I would pay $36 for the same amount of drink buying it in bulk at Walmart."

What this tells me is that you are math-challenged every morning, and not just on Mondays.

One day, when I want you to write me a check, I'm coming early in the morning.

[SoothingDave]

What are you talking about?

To get 12 liters of drink, it would cost me about $1/liter with the sodastream. Or $12 total.

To buy the same amount of Monster at Walmart, at $6 for 4 cans, or (roughly) $3/liter, it would take 12 * 3 = $36.

Where is the error, other than my rounding 2 US pints into a liter?

[secret garden]

Did you just call an engineer math-challenged? What is going on in this room today? Stop it right now.