Pop or Soda-pop would only be used at a Happy Days fan club meeting.

Soft drinks (softies) and fizzy drinks (fizzies) are used interchangeably.

Coke means Coca Cola and is found almost everywhere. If there is only a different cola, you will be offered or given this instead, depending on the location, the barman's mood, or what you are wearing.

Lemonade is a clear, bubbly, sugary, lemony concoction. Sprite is not lemonade here. The yellowy, bubbly, less sugary, more lemony concoction, similar to Lift, is generically a lemon squash. Our lemonade looks like Sprite and tastes vaguely like Lift.

Soda would usually be interpreted as soda water.