You must bring a small jar, fill 3/4 with fresh water.
Cut the lemon into slices and add it to the jar. Add any fresh fruit of your choice, whole or diced or sliced. Optional: add mint leaves.
Leave to macerate for at least 30 minutes in the refrigerator so that the water has time to aromatize ... It can be kept for 24 hours. We can taste the fruits afterwards!