score:7
How big is your burner? Take your burner to a local ferreteria (hardware store), and simply say 'Tienes Combustible de alcohol' . That should do the trick. If not go to the big department store EL CORTE INGLES (you will find them online). They have a huge camping/outdoor department and should know where to get it if they don't stock it. Have a great time in Spain!
Here's the link for El Corte Ingles
https://www.elcorteingles.es/centroscomerciales/es/eci/centros/centro-comercial-malaga