Hi, I want to set up a secured public wifi hotspot in my coffee cafe. I think once I configure a wireless router with "always on" option I can just turn on the router and I am good to go. How do I set up the authentication page or the splash page as user tries to access wifi? The problem is I can not keep any laptop or desktop(but I do have my Android tab) in my shop so how do/can I authenticate the user without any computer?. Is software like wiwiz of any relevance to my case?
Any guidance will be appreciated?

Thanks.