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Tap water is safe, so far as I know, in hotels, bars and hostels. I've never had any problem and always filled from the tap. Outdoor fountains will be labeled "agua potable" or "non-potable."
Spain is very much a first world country. If anything, Spaniards have a bit of a cleanliness fetish...
Problem with dehydration is that it effects your judgement. You don't realized you're dehydrated and impaired. I was walking by myself and with no one who could say, "Hey, you're losing your mind!"
I learned that the hard way after passing out at breakfast in Los Arcos. Face down in my eggs...
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