I went to France for four days and ate at McDonalds five times (my wife is not very adventuresome with food). The thing I remember most is that they serve 'fry sauce' which is really tartar sauce. Those guys put tartar sauce on everything. You have to ask for ketchup if you want that.

And yep, you can get wine and beer as others have said. And at the ones I went to I could pay by credit card.