Some fans are even crossing state lines to get this flavor.Credit: Allrecipes / AdobeYou can take the girl out of the South, but you'll never take away her reverence for Southern soda.I may live in the Pacific Northwest these days, but one look at my fridge and it's clear: I ain't from around these parts. I grew up on fruit sodas from 100-year-old-plus brands, such as Grapico and Cheerwine, and despite traveling all across this country as a trav…