Clothes, food/drink, drinking water...everything else is there. I wrote a review of it on another site. I copied and pasted it below:

It is absolutely perfect - for what it is. Visited: February 2003
Marty Fredericks from St. Thomas, Virgin Islands
We live on St. Thomas, so St. John is our closest "get-away", and Concordia is our favorite spot to really get away. We've been here several times, and are so relaxed and happy each time we return.

We both work in the tourism industry and when we need a break, we really need a break! And Concordia fits the bill. One caveat: make sure before you go that you realize that this is no Ritz Carlton. It's like camping, but in an upscale camping sort of way.

First off, you will need a rental car (we bring ours over from St. Thomas on the ferry,) as this is way out on the Souteast side of the island. Plus, you will want to explore all that St. John has to offer. And she's got plenty to offer!

The eco-tents are really nothing more than wooden frames with a roof and plastic sheeting for walls. Although, the sheeting can be rolled up so that you have an incredible view of the Caribbean, and there are screens to keep the bugs out. Sitting on the balcony with a bottle of wine and the full moon shining over the Caribbean...this is what "roughing it" is all about!

The eco-tents sleep six people, and are very ecologically designed. Batteries for your lights get charged from solar power, water for your shower is stored in a painted black barrel over your head and heated by the sun, the self-composting toilet makes great fertilizer for the foliage. The list goes on and on. You even have your own weather station with instructions on how to use it.

A stay at Concordia is like making peace with Mother Earth - no TVs blaring, cell phones ringing, horns honking...just the feel of the never-ending cool breeze and the gentle sounds of the surf far below you.

The staff is quite friendly, and knowledgeable, too. And there is even a small store in the lobby/office for those necessary items. For those of you that need to be pampered, there is even a freshwater pool hidden amongst the trees on the hillside.

My wife and I thoroughly enjoy our stays at Concordia, and, if you're are the adventuresome type, you will, too. There is a notebook in each of the tents that you can read to find out what other people's experiences have been like here, and they are a wealth of information. Feel free to write one of your own before you leave. It's a quaint custom, too. It kind of adds one more touch to the feeling of really belonging here.

Hi Padlin, I understand that you pick up your linens at the time you check in. Bring your own flashlight, food, etc. camping type kitchen with butane stove, H20 cistern on roof, Solar electric lites. No outlets to power up a hairdryer, recharge batteries, etc. we are bringing a water purifier as I am ridiculously sensetive, 2 flashlights, beach towels, and a pad lock, just in case we need one. You can leave passports and plane tickets in a safe at the office, but they won't keep jewelry. Hope what I have come up with helps. we will be there on Sat. the 23rd. 3 more days!!!! Yay!! When are you going?

Won't need a lock, as there is one on the tent. A water purifier? Bottled water is already pure, isn't it? You aren't going to drink the cistern water, are you? And what will you need the flashlights for?

Thanks all.
Marty, I had read your thread, and you've answered my question, thanks. I'll leave the flashlights home, I was hopeing they'd have everything and it sounds like they do.

Dtreks, We're going to the island on the 7th and will be down the road at the tradewinds for a week before going to the eco-tents for a few days on the 14th.

Bob (padlin)

Cistern water is rain water? NO? Not safe for drinking I guess? Marty, help me out here!!

Not Marty, but...yes, cistern water is basically rain water. However, it can be trucked in desalinated water as well. With cisterns, you need to know who is maintaining them. If the person who maintains it says they drink the water, I would also. However, people in the states don't seem to trust their own municipal water supply, so who knows!