I forgot to mention 2 other ways to use the lemons from your lemonade making.
First, you can grate off the lemon zest and freeze it. Then you have lemon zest when a recipe calls for it, such as the yummy blueberry pie recipe that I love.
Second, take a lemon half after you've squeezed out the juice. Use it to scrub and disinfect your kitchen sink by sprinking salt into the sink and then use the lemon, cut side down, to scrub. It will gently bleach away discolorations as well. Cheap, natural, and effective cleaner!