*To make warm water, I usually mix boiling water from the kettle (I hope you have one?!) and fridge filtered water. Another option is to turn off kettle before water reaches boiling. You just have to wait by the kettle and turn it off on time.
In a glass, squeeze lemon juice with hand held lemon reamer or glass lemon juicer reamer. Discard seeds if necessary.
Add water, stir and drink while warm.