This is the easiest trick to keep lemons for ice water!!! Whether a glass or pitcher. Just slice up your lemons, place them in a cupcake pan. Fill with water and freeze. Store them in baggies in the freezer until ready to use.
If you only want one glass of water with lemon, you just take one and then you don’t have the rest of the lemon to use or waste. Although there are lots of uses for lemons!!