3 1/4 cups water
1/2 cup real lemon juice
1/2 cup sugar
Pour ingredients into juice jug, stir and enjoy!
This recipe can easily be doubled, I doubled this and I just about overfilled my 2L juice jug.
What I really like about making lemonade myself is that you can adjust the sugar, I like it less sweet than the store bought stuff (or the stuff in a can).