Dr. Pepper > Pibb for me.
RC Cola is definitely a big thing here in the south. One of my former co-workers has a weird ritual of buying RC and Moon Pies as a snack. We used to tease him about it endlessly because it always had to be those two specific items.
Cheerwine is another southern drink. I'm not a fan, though. It's too sweet for me.
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Gamertag-Murphiroth
Pokemon Black-1978-9490-1161