Just looked at the Mercadona supermarket website but they close around 21 or 22. I think you need to pick up some things at a service station.
Try this site - if it copies properly on my iPad. If you scroll down you will see the OpenCor supermarkets in Valencia and their opening hours.
If it doesn't copy properly, type OpenCor into google and click on buscar una tienda and then click on Valencia province. There is a list of 9 supermarkets in Valencia that are open until 2am.
Hope the link works!
Worked to perfection Solysombre, found a branch on Carrer de Ramon Llull, only a slight detour en-route to Patacona, thanks a million.
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