Make lemon water by adding a 1/4 of lemon, sliced, to an 8 to 16-ounce​ glass and then filling the rest with filtered water. You can allow it to sit for 12-24 hours or just squeeze the lemon juice right into the glass. If you choose to infuse it, remove the pith (the whitish part underneath the colored outer portion) before placing the lemon in the glass to prevent it from becoming bitter. Add a small slice of peeled ginger for a spicy kick.