How to solve a cold when swimming?

I think the water temperature is low. This happens when I swim in winter. My body fat doesn't store enough calories. It is recommended to drink some hot water and chocolate half an hour before swimming. Be sure to warm up before going into the water, jog until it is slightly hot, move all joints and stretch ligaments. Then try the water temperature, sit by the pool, put your feet in the water first, and pat your face, neck and chest with some water to warm your whole body quickly. Feel comfortable with the water temperature before entering the pool. First make a quick breaststroke sprint 100 meter, and then practice other strokes. So if you are fully prepared, there will be no problem. The main thing is not to be afraid ideologically, and turn enthusiasm into the driving force of swimming. There is also the usual attention to strengthening exercise, doing some auxiliary exercises, push-ups, pull-ups, and strengthening strength training with dumbbells and barbells. Diet and nutrition should also keep up! I wish all the best and peace!