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How to make coffee soda
Pour your coffee grounds and water in a large container.
Keep in mind that you'll need to make your cold brew coffee the day before you want to make your coffee soda, because it needs to sit overnight. Add the grounds to your large container, and then pour the water in over them.

Select from: A). Your bigger container is probably best because you'll use less water. Try having a bucket or cup that you can dump the grounds into. B). Don't fill the contents completely. Only fill a few spaces at a time. C). Stir your mixture, and then pop it in the fridge. The quality of water can make a difference. D). Leave the lid on and wait for the coffee to brew. Pour in 1 cup (237 ml) of cold water and add more water.
C).