Resist the fast fashion urge stateside for a while and stock up while you're in Spain. Not only is it incredibly cheaper (see above) but the assortment has much more depth and interest.
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foreigners who intend to enter the national territory must continue to prove that they have a minimum amount of €100 per person per day, those they intend to stay in Spain with a minimum of €900 or its legal equivalent in foreign currency, provided that they are required by the officials in charge of carrying out the ...
If you're by yourself, you can live on €1,000 per month in Spain. This includes room rent, groceries, health insurance, rare use of public transport, eating out a few times a month and shopping moderately.
The required amount of money you need to present to the Spanish border officials is regulated by the Ministry of the Presidency of Spain (PRE/1282/2007) and is set at a minimum of EUR 100 per day, with a minimum of EUR 900 per person regardless of the intended duration of the stay.
Is 100 euros a day enough in Barcelona? €100 per day is still not a huge amount but you can probably get by on it. You should perhaps read up on free stuff to do during the day and not plan on paying to go inside too many tourist attractions.