Hi, I'm an Electronic Engineering student from Argentina. I've been working on Freelancer for more than a year now, and I've completed more than a dozen projects. Also one of the projects was about a RFID kiosk for water dispensers, with cash management and security verification, that project is in my porfolio, you can check it for further informaiton.
My bid is only for the design, if you like to build a prototype it's also possible but we'll have to arrange the quantity and price.
Please if you have any questions feel free to contact me.
Regards,
Esteban Toribio.