Begin by pouring the boiling water over the tea bags in a bowl. Cover and let stand for 5 minutes, then remove and discard the tea bags. After transferring the tea into a medium pitcher, mix in the sugar substitute.
Next, add the cold water, orange juice, and lemon juice. Stir, cover, and then refrigerate for at least one hour.
When ready to serve, add the lemon-lime soda to the tea, and stir well. Pour over ice in individual glasses.