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HiperDino: 

Just between the Purple Turtle and The Crowded House, is a great supermarcardo called HiperDino.  Pretty reasonable prices, and they take credit card.  You can park right out in front if you have a car, but it isn't too far to walk otherwise.  Water is about €0.80 for a 5 litre bottle.  Watch for red wine called Condado de Argiz....  it is pretty good for about €1.50 per bottle.  They also have some generic beer on sale for as little as €0.15 per can.