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Pick up a sim card at your arrival airport in Spain. The services there are experienced with tourists needs, and have excellent 30 day deals. Over the last few years I've used both Vodaphone and Orange sims this way. If a "top up" is needed, it can be done at most supermarkets in Spain.
Also...
Go with Orange.
I had Vodaphone in Spain (CF) in 2016. It was fine until credit ran out. Wasted an hour in a Vodaphone shop with no help. Went a supermarket and added credit.
This year I got an Orange sim and 2 month plan in Madrid airport on the way to Lisbon. It worked fine all the way...
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