8 to 10 c. water
1/2 to 3/4 t. stevia (to taste)
Experiment with different amounts of lemon vs. sweetener--everyone likes their lemonade different!
Blend very well--works best in a blender to get the stevia to blend in.
I also make a 'slushy' by replacing some of the water with ice cubes.
Also, for St. Patrick's day, I made a 'limeade' slushy by adding lots of spinach to the original recipe (if you do this, blend the spinach and water first before adding the ice)