Combine hot water and sugar in small saucepan on the stove over medium-high heat. Stir until the sugar dissolves then remove from heat and let cool 5 minutes. Note: liquid stevia users should skip this step!
Make the lemonade
Stir simple syrup (or stevia) and lemon juice together. Add the 6 cups of water then 2 cups of ice and stir well. Taste and add more water if it's too sweet.