Whether or not you can drink lemonade the next day depends on the conditions under which it is kept, if it is kept at a low temperature and sealed, it is drinkable, but not recommended in other cases.
Lemonade itself has vitamin C, sugar and other ingredients that oxidize and deplete when exposed to air, so it’s best to make it the same day and drink it the same day. If you keep the lemonade properly sealed to minimize contact with the outside world, and place it in a cold environment where bacteria cannot grow easily, you can drink it until the next day.
In other cases, such as lemonade containers left open, ambient temperature or air humidity, etc., the next day in this case will be placed in a large number of bacteria in the liquid to make lemonade deterioration, direct consumption of gastrointestinal infections, easy to cause diarrhea, abdominal pain, acute inflammation of the gastrointestinal tract, and so on.