Hi dear, i have POS system ready to deploy, i have developed it on C# and mysql.
It can be used offline and online with android reporting and multiple number of counters can be set based on requirements, as you said facility does not have an interent connection so it will not be a proclem we can set up a server on a pc or server hardware based on the budget you have, the pos is already tested and deployed on a lot of facilities for clients which means i can set up the modifications required by you and put it in working state in less than three weeks,.
I will send you screen-shots right when you will chat because i cannot attach it here with the bid. it is with barcode system as Well C# and my sql is the most stable platform for POS.
It can be configured with a touch screen as well and can be used to manage a fully functional multi-cuisine Restaurant as well.
I can also work on Different Open source POS systems e.g. NEXT ,Open bravo etc
i can modify it according to your requirements within a day or two. So please contact me so that you can start your work ASAP