Since the 4th of July is in a few days, I thought I'd give this a go myself.
I was out today, while the Bean was at his Summer Drama Troupe practice and grabbed a Mt. Dew White Out from the gas station.
In the video, she used a white Powerade & a white Sobe Life Water.
Here's how mine turned out:
This is Mt. Dew White Out- 30 grams of sugar
V8 Splash - 14 grams of sugar
Propel (with blue food coloring) 0 grams of sugar
There are also plenty of Gatorade & Powerade flavors out there with the medium & no/low sugar contents, so they are great for the middle and top layers.
Full instructions in my prior post here.