Who in these parts isn't loyally addicted to the Texas-born drink that was invented in a Waco drugstore? If you're as devoted to the soda's sweet taste as you think, you need to make the pilgrimage down Interstate 20 to visit the oldest Dr Pepper bottling plant in the world. Not only has the Dublin Bottling Co. been in business for 110 years, but it is the only place where the original formula is still used. There, the drink is still sweetened with corn syrup, pure cane sugar and nary an additive, and you can load the trunk of the car with a few cases before returning home. You'll also want to visit the museum, get a tour of the plant and toss back a cool one. Seventy miles down the road, it is a trip, nostalgic and worthwhile, into your childhood.