A short episode explaining which supermarkets to look out for in Spain - including the one which you'll find open on a Sunday :-) 

Supermarkets mentioned:

 Mercadona https://www.mercadona.es/ 

Consum https://www.consum.es/ 

Carrefour https://www.carrefour.es/ 

Lidl https://www.lidl.es/ Aldi https://www.aldi.es/ 

Dia https://www.dia.es/compra-online/ 

Masymas http://www.masymas.es/ 

Hyperber https://hiperberonline.com/ 

Travel recommendation: I used Staysure for my travel insurance and they gave me enhanced COVID-19 protection and a FCDO 'Non Essential' destinations cover! If you use my referral link at https://paulteague.net/staysure you can get up to 20% off your first travel insurance policy (subject to T&Cs).