I think this sounds like a good idea. I don't know your area but if you have done some research and looked around and this is a one of a kind idea I think it is great. If I could offer a few thoughts and take them for what they are worth just some thoughts I had when I read your message above.
1. One thing that might help you draw people to your business could be that you offer some kind of like sport drinks also. A lot of time if you are around a college or university if you can bring in the athletic crowd others will tend to follow.
2. The fact that you have a lot of family and friends that want to help you get this off the ground is very cool. One thing to always remember when using others to help you accomplish your goals is that if they take care of you make sure to always take care of them in return.
3. I actually think your legal issues will be less then a regular bar because of the fact that you won't be serving alcohol. Plus you can spin your business as something that helps the community and doesn't add to it decline.
All and all I think you have a great idea and I think you are going down the right path to achieve your goal. Please touch base with an Accountant as soon as possible that is always a smart idea and a good habit to get into from the start of any business venture. I think you have a great mind and head for looking around your area to find a niche and I would be willing to bet that this won't be the only or last business you start. Have fun and make lots mistakes that is what in the long run will make you great.
Lextalonios
(The Problem Solver)