In reply to sam benson:
A little late but thought the info might help others too...
The shop Oxigeno in Oviedo can supply all your needs.
In cangas de onis gas and alcohol are available.
White gas isn't, despite the camping shop selling the stoves!
The supermarkets were very limited in combustible liquid.
The hardware store sold alcohol but little else.
I ended up using turpentine (aguarras) to fuel my MSR dragonfly.