As rice put up in a unit container and bearing a registered brand name is taxable @ 5%, the suppliers of branded basmati rice located in other States would be charging IGST @ 5%, whose credit can be availed only when the recipient is registered under the CGST Act, 2017.Therefore, if you want to avail of input tax credit, you must get yourself registered. That said, for making inter State purchases one is not mandatorily required to be registered.
(FAQ-9 (ii) :Food Processing)