This question is most often asked because we decided to talk about it.
Before training. Drink water if you want. You don’t need to specifically pour in a liter of water before training, because with a full stomach it will be uncomfortable for you to move actively. The best option is to drink 200-600 ml of ml of water 2 hours before training.
During training. Unambiguously drink water in between exercises. Depending on the intensity of the exercises, drink 500-1000 ml of water during the workout.
After workout. Drink water necessarily. It is advisable to drink 30 ml of water per day per kilogram of weight.