Supermarkets

If you use google maps, you can zoom in and businesses, churches etc are shown. 

At a quick glance, it looks like there is a butcher's shop and a petrol station with a bar attached, but not much else. La Parroquia is a small village with a population of about 500, so I think your nearest supermarket will be in Lorca - 20 mins drive away.

Hope this helps!