Accommodation shall be provided by the institute, otherwise cheap living options will be available through brokers.
Different universities will have either of the following facility:
International Student Cells of respective colleges will assist you in finding accommodation.
Indian cities are equipped with traditional brick and mortar "kirana" stores for buying all types of essentials. The small towns, just like the big cities are increasingly getting equipped with some malls as well as doorstep delivery of essentials, apart from having the traditional mom and pop stores.