We did the Camino Frances in 2015 and just carried two empty plastic water bottles which we filled at each village/town. Most had fountains or taps in the square, or somewhere in the town along the route. Never had a time when we lacked any. Also, the water was very good and usually cool.
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon