You could do that. Or you could take a little time and get to know people.
The funny thing about message boards is that all you really have to go on is a persons written word until you meet someone face to face. It takes a long time to build a feel for a person. Just like it takes a long time to build a real friendship.
Take some time and get to know some like minded folks. You might find out that you don't even want to be involved with some people. There's a lot more to group compatibility than a desire to prep or be self sufficient.
Or just form a group of complete strangers and hope it works out.