After giving this much thought and other than tea and coffee... my response is:
Glass coke bottles:
Tastes less "metallic" than the cans.
More bubbly than the PET plastic bottles.
Richer than the post-mix (McDonald's, Burger King/Hungry Jacks, etc.)
So on your next shopping centre, servo, 7-Eleven, or convenience store trip, grab some glass coke.
Though it's a little more expensive.