Jewell Isaland Casco bay

I have kayaked to Jewell Island in Casco Bay Maine several time but never overnight. I plan on going out shortly to stay all night. I have dry suits and a good tandem kayak but I can’t remember if there is any portable or drinking water on the island. I am thinking no but not sure. Also is it “okay” to go early in the season like now and if the restrooms are unlocked and having a campfire.

Thank you