You wouldn’t think of watering a plant with soda. – Michelle Obama
I just heard about a proposal to allow advertising on city-owned vehicles. Wow, a match made in heaven. Look at the existing colors ... Pepsi gets to advertise on police cars and Coke on fire engines.
Here's a side benefit: The police can use Pepsi cans as a weapon: Throw 'em at the perpetrator. Not enough water to douse the fire? Extinguish it with a Coke or two.
Which reminds me of something Steve Jobs said to John Sculley (CEO of PepsiCo):
“Do you want to spend the rest of your life selling sugar water to children, or do you want a chance to change the world?”
Unfortunately for Jobs, Sculley took the job at Apple and fired Jobs the following year. Of course, Sculley ran the company into the ground and Jobs came back to save it.

Whether you drink diet soda or the sugared stuff, replace it with sparkling water. Believe it or not, other than the high-intensity of the sugar or artificial sweetener, it will taste very similar.
Try it for a week. Most likely you won't miss the other stuff. In the past, I was a Diet Coke drinker. For the most part, I drink "plain old water", however, if I want the taste of carbonation, sparkling water "hits the spot".