I gave up Diet Coke once upon a time. But to supplement my caffeine dependency, I started drinking the “energy” Crystal Light and Mio drink mixes. I enjoyed those but I noticed I had more heartburn with them. So I went back to Diet Coke. I guess this anecdote isn’t a true cold turkey example. I only switched to the nicotine patch of soft drinks.
Both. And yeah, I like the store brand liquid flavors better too. Like the pomegranate or dragonfruit.