As a person that regularly fasts this question just made me exit the site immediately.
It might be regional, but I think "soft drink" or ""fizzy drink" are far more common. I can't recall the last time I heard "pop" used in this sense.
An entirely unscientific search on some sites (Deliveroo, Ocado etc.) shows "pop" either not returning any drinks (Deliveroo near me) or returning pretty much the same as "soda", with Ocado returning the "fizzy drinks" category for both searches.
A 1996 linguistics study inspired a map [...] showing “soda” prevalent on the coasts, while “pop” held sway in the Northwest and Midwest, and the generic “coke” took the South. There must be some electoral significance to this.
https://ideas.blogs.nytimes.com/2008/09/11/the-soda-vs-pop-m...
It absolutely does not include lemonade! I never in a million years would think of lemonade as remotely related to "soda". Our lemonades are not carbonated, and are just lemon juice, water, and sometimes sugar.
The question is so surprising to me. Where are you from? To you, what does "soda" mean? What does "lemonade" mean?
I love your sense of wonderment at different cultures, wait until you hear about what "chips", "pants", and "fanny" mean in the UK!
And now checking what real lemonade looks like -- I think we'd call that lemon soda but it wouldn't definitely belong in the "limonadi" category. So a bit confusing inversion of terms during some cultural adoption!
Edit: I see the usage is closer to UK naming convention, so maybe that's the history.
Yeah, here in the US, I don't think you can call a carbonated beverage "lemonade", even if it has lemons in it. That would be "lemon soda", I suppose, though I don't think I've ever seen that. Lemonade is a mixture of still water and lemons, sometimes sweetened, with ice, that you drink out on the porch during summer in the afternoon.
Your question hit me like: "does 'wine' always mean 'beer', in Finland, or only sake (rice wine)?" I knew there must be a culturally different usage of language somewhere but I had no idea where! Turns out it was lemonade that was different. TIL that other places have carbonated lemon drinks.
On a more serious note, your comment would be a lot better if it had a constructive tone (like "good concept, but for many people going 4 hours without food will not make them feel bad").