Caffeinated Chocolate Milk Straws: With 200mg of caffeine per straw. Here’s what you do: pop the ends of the straw and mix the powder with 8oz of milk (of course, you can add more or less, depending on your specific tastes), stir, and then suck it through the straw. It’s that simple to get delicious chocolate milk loaded with caffeine. 200mg is about 2.5 energy drinks worth, in case you’re wondering. Caffeinated Chocolate Milk Straws – just add milk (we’ll take care of the buzz and the chocolate)!