Boil the tea, any black tea is suitable, it can also be flavored with a fruity note to taste.
When the tea is brewed, cool it with cold water or ice cubes and add the chilled blood orange juice.
The tea has a slightly bitter note, which can be wanted. I prefer one lump of sugar per 0.2 liter glass.
There are no limits to your mix. B. also take grape juice and experiment with other types of tea. Personally, I think it`s just important to always take 1/3 tea, 1/3 water and 1/3 juice, otherwise the mixture is too strong and no longer a thirst quencher.