IMO, no need to provide a grill. If a potential renter wants a grill, there are many places who offer and you will still have renters. My place has $2,000 worth of grills and I do not provide the tanks.
I see where renters either expect the moon or abuse your home.
I actually had a snowbirder once negotiate rent with me and wanted me to provide amenities such as bikes, etc.......paying a dirt cheap rent (because the place in PCB was cheaper) and including utilities. I would have gone in the hole approx. $100/mo. This ain't PCB and I would rather my place sit empty.
When we rented beach homes at St. Geo. Is., we never had an issue buying a small charcoal grill for our few days or two week stay in a rental. And, we would check with the owner to see if someone was coming in behind us and leave it for them.
Good luck!!!