Who doesn't like that sugary hit of caffeine on a hot day? Yet, soda is really bad for your breathing! It's the carbonation. Even flavored mineral water causes breathing problems for folks with COPD.
http://www.cbsnews.com/news/drinking-soda-raises-risk-for-asthma-copd-study/
Like giving up Sickerettes, giving up sodas can only happen with "what do you do instead?" Did you know there's a website for that?
https://www.cdc.gov/healthyweight/healthy_eating/drinks.html
I have ice cold water with me 24/7. I just add a slice of lemon or lime, fresh berries, or orange slices. I still drink my coffee - 2 cups at home in the morning and 2 cups throughout the work day - never after 2 pm
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2727200/
I rarely drink alcoholic beverages - a beer on a hot summer's day. I can't get through a six pack in a Year!
We're all different. Share your ideas on beverages and breathing... we can learn by sharing!
I make my own flavored sun iced tea. I put a large cold brew tea bag in a big glass of cold water and put it in the sun ( you can put the glass in a sunny window in the winter). Let that steep for quite awhile. Then I brew a cup of green and mango tea and let that sit (bag in) until cool. I pour both in a small pitcher and have a concentrated tea blend. Start, then, with a glass full of ice and half of glass of cold water and add the tea blend to suit how strong you like your tea. No sugar needed (and you can get the benefit of green tea without the blah!)