[Pine]

Iced green tea is great. Also iced fruit and herb teas.
I just get the tea bags, brew it up, allow to cool, then pop in the fridge overnight.
Bit of stevia, or agave syrup is good to add too.

[MerellBrown]

It depends on what you want to add. You can simply add stevia or anything like this.

[cowolter]

I’d recommend cold brewing the tea and sweetening it naturally with stevia or letting fruits infuse into it while it steeps

[EllenCox]

Herbs or some vitamins

[ketomethod]

That's what I'm talking about...cucumber, mint, strawberries..you really can't go wrong there!