on-site kiosk

I buy water.

私は水を買います

I buy water partway through exercising.

私は運動の途中で水を買います

I buy water with my friend partway through exercising.

私は運動の途中で友人と水を買います

I buy water at the gym kiosk with my friend partway through exercising.

私は運動の途中で友人と体育館の構内売店で水を買います

I buy water at the gym kiosk with my friend during the break, partway through exercising.

私は運動の途中で友人と体育館の構内売店で休憩時間に水を買います