So you get some lemons and then you'll need sugar, ice, and optionally, spirits such as rum or bourbon. if you're complaining that the lemons cost almost as much as a six pack, then buy limes instead and refer to the recipe below.
squeeze lemons over a wire strainer into a container until you have at least 1 cup of fresh lemon juice.
meanwhile make a simple syrup with 3/4c sugar and 1c water.
combine these two liquids in a 1L jar, top off with water. chill.
then put ice cubes in a tall glass and mix 1 part spirits to 3 parts lemonade. you could also drink the lemonade by itself.