Start by making a simple syrup. Combine stevia and water and bring to a boil. When the mixture is clear, it is ready. Cool to room temperature.
Bring 3 quarters of water to a boil. Add tea bags. Steep for about 3 minutes. It will be pretty dark. Cool completely.
When both the tea and simple syrup are cool, pour in enough simple syrup until it as sweet as you like it. I usually start with half and go from there. As much as I love sweets, I do not like overly sweet tea. It is completely up to your taste as to how much stevia water you use.
Pour some tea into a glass and add your freshly squeezed orange juice. I like lots of ice in my drink. And a squeeze of lemon if you like too.