Yes, I've done it. I made cold brew, and forced corbonated it with co2 in a pressure vessel. I love coffee, especially cold brew, and I love sparkling water. They are essentially the only two liquids I drink. It was terrible, I was disappointed. I would be interested in trying it with nitrogen, instead of co2, I think it would be amazing. The starbucks nitro cold brew is after all one of finest beverages ever made.