I only drink diet pop and only at work, but even so, it's not good for you. If nothing else, the acid is bad for your digestion and your teeth.
I drink a lot of fluid at work, and like to avoid coffee in the afternoons, so I either drink Earl Grey (or Lady Grey - has a citrus note instead of bergamot) tea.
If I want a cold drink, I make this:

I like it fairly weak. Weak, like lemon drink.
I drink a lot of fluid at work, and like to avoid coffee in the afternoons, so I either drink Earl Grey (or Lady Grey - has a citrus note instead of bergamot) tea.
If I want a cold drink, I make this:

I like it fairly weak. Weak, like lemon drink.