They provide at least 4 bowls, 4 plates, and 4 picnic sets of plasticware- sometimes I have had more- othertimes only that many- they seem to just add a set in when they are cleaning between guests so if the previous guest didn't use them you have extras- if they used them all then you have the minimum amount. You do get a new set at you 4th day trash and towel.
We always bring a few with us so we don't have to worry about it but use what is there first (we drive so I just have them packed in the cooler with our food).