In my opinion, there is no definitive answer as to whether or not to drink during training, and even the opinions of experts differ.
Added 1 minute ago
And yes, I agree with Heroist and Revan, you shouldn't immediately start with heavy loads if they make you feel bad. Even if there is no weight loss effect at first, your body will get used to the loads, and after some time, it will be able to handle them. Otherwise, you'll overexert yourself after a couple of times and be forced to take a break for a couple of weeks, which is even more harmful.
WE ARE SERIOUSLY DISCUSSING SPORTS.
Where do we end up when we save the world?