Wash the cucumber and lemon thoroughly.
Slice the cucumber and lemon into thin rounds.
In a pitcher or large glass jar, add the sliced cucumber and lemon.
Pour 4 cups of water into the pitcher and stir gently to mix the ingredients.
Cover the pitcher and refrigerate for at least 1 hour to allow the flavors to infuse.
When ready to serve, add ice cubes to individual glasses.
Pour the cucumber and lemon infused water into the glasses.
Garnish with fresh mint leaves if desired.
Stir and enjoy the refreshing and hydrating infused water.