Lemodade. I don't drink it often, but it's really refreshing. And I would never have the diet varitety - diet anything usually means that it's been doused with toxic chemicals and I don't need to give my body anything more to deal with.
The only soft drink I have now is ginger beer/ginger ale, but thai is more of a mixer than your standard soft drinks. When I did drink proper fizzy dribks, my favourite was Sprite, with 7 Up and Tizer following on behind.
Is it the 'original' yellow or current substitute 'red'?
The 'red' when I was a kid was 'Cherry Cheer'.
Not too many drink manufacturers' make the proper 'yellow' Creaming Soda, these days, more's the pity!