I still buy C2 as my primary daytime soda.
Of course when I'm at a resturaunt with a self serve fountain I just mix my own. Depending on the resturant I get:
1. Caffiene free diet coke + regular Dr. Pepper
2. diet coke + regular Dr. Pepper
3. diet coke + regular coke
4. diet Dr. Pepper + regular Dr. Pepper
Number 1 is hard to find in self serve fountain but a local pizzeria with very high health board ratings has that setup.
Number 2 and 3 are very easy to find. 4 is easy to find as well but since Dr. P. doesn't sell a C2 equivalent I'm willing to give a partial nod towards the company that does.
Where possible I bring my own can or try not to eat at any resturant that doesn't have those combos.
Worst case scenario if I don't have a can with me and can't mix it myself I get
5. Diet coke
6. Dr Pepper
7. Regular Coke
in that order.
I have 12 packs in my fridge, closet, trunk, and occasionally in random locations.