Several things to do not happen in the U.S.
cop ordered them to turn-off the camera. The U.S. First Circuit Court already rules we have a 1st amendment right to film Public employees in the execution of their duties.
cop claims husband punched him. Conveniently the camera was off, so we don't know if the cop is lying. This is why cameras need to keep running.
I can't imagine why a store would refuse a sale. I used to fill-up my entire cart with water, simply because I wanted a month's supply instead of going back every day.
If the couple is handing it out free, or re-selling it, who cares? That may be a crime in the UK but isn't a crime in the U.S. (What IS a crime is refusal of service to non-white customers.)