In the summer months, a person on the road, in a car, who has a bottle of filtered water, a small jar of coffee, some sugar (if required) a polystyrene cup and a plastic spoon can make a cool or semi warm cup of coffee in the car, ( a variation of iced coffee without the ice, without the milk, cream or icecream) while parked in a safe place.
Its also true its nice to sit in air-conditioned comfort, so is it possible to ask (for payment of the price of the coffee sold in the eatery ) for an empty, new, unused disposable cup to mix your own coffee while sitting down in the dining area?