Place a small amount of water and both of the drink mixes into the shaker bottle. SHAKE UNTILL ALL POWDER IS LIQUID.
If you dont have a shaker bottle you can mix really good with a cup and a spoon. you just want to turn the powder into a liquid.
kind of like a syrup!
Pour the "syrup" mixture and the 1 liter of carbonated water into the bottle you chose to store it in and gently mix together.
(you can add less water if you want it stronger i think its already pretty strong though.)
Enjoy as is or on ice