As far as I know, 7-Up and Dr. Pepper are both owned by a company not affiliated with Coke or Pepsi but just have distribution deals with both depending on whatever sales territory you happen to be in. I'd use Sierra Mist before Mountain Dew though since it's far more of a match to Sprite's flavor.
That said, I voted for Mug, Gatorade, and Coke. I didn't vote for either water because I never drink single-serve bottled water because the plastic they use for those bottles makes the water taste like absolute shit. One small perk of being a Louisianian is that we have Kentwood water (yep, home of Britney Spears) and the kind they make in a 1-gallon jug tastes ridiculously better than the deer urine made by big water companies. I also didn't vote in the citrus category because Sprite tastes overtly chemical to me and the Dew don't do it for me. Code Red ain't bad though. I just fucking miss Surge since it was orgasmic.
Mug was barely my choice but not because of Barq's contending but rather that I don't much care for either since they're both paltry. A&W and IBC are fucking awesome though and Virgil's is nice when you have $6 to waste on a measly 4-pack.