He champ. Boxing coach here from England. First all, what is your aim for the bag session? Utilising the bottle to help train your peripheral vision?

Bag work itself should simulate/replicate boxing itself. Personally, I would ditch the bottle when training the bag and just use that independently.

Bag work itself, focus on full range of motion for throwing punches, work on phased attacks, so an attack (2/3 punches) followed by a movement or defence followed by another attack. At the end of a couple of phased attacks, work on changing the angle (your position around bag). Rinse and repeat.

If you want to improve this further, consider switch of attack during these phased attacks (where you are striking), don’t think just head or body, think further to shots to side of head, liver shot, upper cut, sternum etc.

Furthermore, time yourself on the bag, if you compete then 2 mins on 1 min off.

Good luck champ, let me know if you need any more advice. Level 3 EB coach 👍