Current Information on Shiraishi Island?

Hi.

I am seeking some up-to-date information on Shiraishi Island, where I am planning to stay for several days.

Is it necessary to bring food to the island or are there enough restaurants and shops where one can buy food?

Is there anything else that one should definitely bring to the island due to lack of availability there?

Do you have any recommendations on sites to see and things to do on the island and nearby islands and other places besides the beach?

Thank you very much in advance.