Thirsty walker! Drinking water from Porto to Santiago

SGIrl said:

I am looking for information on the availability of drinking water walking the inland route from Porto to Santiago please.

I generally drink a lot of water (at least 2-3 L a day) so I'm a little concerned that I'll be left thirsty!

Not sure whether to buy a hydration bladder or stick to bottles...

I have read some older threads on this point and I have Brierley but I would appreciate up to date information if possible.

Thank you

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this info is 1yr 'up to date' - and i'd say:
relax - you are not going to travers any deserts, death-valley, or long stretches without services on that route. plenty of cafe's/supermercados/mini-mercados/restaurants) to replenish your water supply (i never used fountains, only store-bought water or what I got in a restaurant) - i never was stranded/thirsty. water bottles were just fine for me - but everyone is different in their preferences/'needs'.
Enjoy your caminho - it's a beautiful one indeed with marvelous sights and folks

I find hydration bladders are great in combination with water bottles, that is if you require large amounts. I sweat a lot, so when its hot I easily drink twice or almost three times as much water as my friends.
If you are backpacking access to the hydration bladder is usually a bit restricted. Even if it isn't it will always be harder to refill than a regular bottle.
Fill your bladder in the morning. You can stash your bottle on the side pockets, drink from there primarily then from the bladder. You can easily top up your bottle as you pass fountains.

Having said this, like amorfati said, you are never far away from water.