I occasionally use a Carbonator cap on a 2L bottle, but that requires a standard CO2 rig. I can carbonate 2L in a few minutes. You'll have to be careful about the CO2 level, as soda typically runs 2-3 times the volume of beer.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk