I agree with the bonzer one as regards the UK perspective (not that that appeared to matter in the original survey - Harrumph! [infringing copyright])
"Pop" is for Enid Blyton stories and comic(book)s.
If I had to come up with a general term for non-alcoholic drinks, then it would be "soft drinks" as a general term and "fizzy drinks" to restrict the list to carbonated stuff.
Something to make Coca Cola weep - if we asked for a non-specific "coke", especially in a pub, we could be given any variety of cola (including supplier's own). But the barman would "eh??" at any other kind of fizzy drink being called "coke".
Lemonade, as we know of it, is a clear drink, lots of bubbles, sugar and artificial lemon flavour. But you couldn't make a shandy with anything other than this type of lemonade and ale!
"Soda" still doesn't mean very much over here. Older people may ask for a whiskey and soda (water), but traditional soda water used to come from dispensers that don't exist any more. I can't even remember what they were called.
In some contexts you would think of bicarbonate of soda, or washing soda, but those usages are also rare. Interesting.
Edit: Snap, Jo!
