Anyone else use soda in there second water bottle

Recently I bike toured around Cuba. I often bought cold soft drinks, usually 7-up/sprite type. I could never finish it all, so I'd dump the rest in my water bottle. Half soda, half water is really nice actually. It was a good treat.

I know a lot of people drink watered down coke when they get a bottle from the feedzone in bike races.

I usually grab a coke in the middle of a 5+ hour ride.  Usually I get the 20 oz version, drink half, and put the half full bottle in my back jersey pocket to drink later in the ride (while stopped).  Sometimes if I really feel I need it, and it's available, I get the 1 liter version, drink what I can on the spot, and fill one of my water bottles.  I never start a ride with coke in my bottles though.

I keep Coke in my primary bottle sometimes.  During the summer few things are nicer than an ice cold coke.

Sugar, caffeine and taste.  Basically what a x2 caffeine gel is, but it tastes better and easier to get down IMO.  Carbonation can be an issue if you don't flatten it out first and drink too much at once.

I rather go with a Radler.  A German friend turned me onto this last summer, half Sprite and half beer!

What? I thought it was supposed to be grapefruit juice?