I heard that the official sour warheads soda isn't sour and at least one user on here is sad about it.
You should know that Malic Acid and Citric Acid (and also Lactic Acid, often used in sour beers) are available as concentrated food-safe powders. You can use them in mixed drinks, including turning that boring apple, grape, watermelon, or lemon-lime soda into something you really shouldn't pour down your throat. Nobody is stopping you.
For people who aren't spice-lords or sour-lords, here is a video with some more "normal" and less extreme culinary uses for acids from America's Test Kitchen on YouTube.
Invidious private version of the video link: Why Acids Are as Important as Salt | What’s Eating Dan?
I've gotten containers of powdered citric acid from the spice section of a middle eastern market. It's a great cooking ingredient in general, since there are a lot of use cases where you need an acid in something and lemon juice or vinegar won't work. Also, it's cheaper than lemon juice by a lot.