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There is a Repsol service station on the SC 20 that can be accessed by foot where many drivers are going south. To get there you can take the number 5 bus to the terminus located on Rua da Poza Real de abaixo. Just several metres uphill you'll come across a mini roundabout, go under the autovia to the other side and immediately turn left up the stairs. Then follow the footpath at the side of the road for 2 minutes and you will arrive at the service station. There's a water tap outside, however I cannot confirm that it's água portable.

(Ah cool, me too. I'm travelling through España with my backpack and hitchhiking. Do you think you could take me there, please?)