5000 expense per day limit for exempted gst

Yes, you would be required to pay GST under RCM basis as the limit of 5000 is to be seen in aggregate(i,e purchase from all the unregistered supplier in a day and not individual wise).

As per CGST & IGST ACT, if the Registered buyer buys a good or avails service from an unregistered supplier, then Registered buyer is required to pay the GST under RCM.

however, as per notification dated 28th June 2016, Council has exempted applicability of CGST if the intra-state supplies of good or services or both received by the registered buyer from any unregistered supplier don't exceed 5000 in a day.

Provided further that the said exemption shall not be applicable where the aggregate value of such supplies of goods or services or both received by a registered person from any or all the suppliers, who is or are not registered, exceeds Rs.5000 in a day.

For RCM case - is there non gst expenses to be include for maximum 5000 cash exp per day limit  ?

Sir, even I am confused on that part but as per general practice which most of the senior chartered accountant are following right now, both CGST and SGST are exempt.