@Waka , I believe the OP is asking about the Primitivo.
Sandals: bravo, good for you!
Getting up in the middle of the night, or what may feel like it: please don't bring this horrible idea of the Frances to the Primitivo. If the warm weather concerns you walk shorter days, walk under a reflecting umbrella, bit don't make enemies in the albergues by waking them up early. Keep in mind the Primitive is not the Frances, and no, you will not het to your destination by noon, unless you het up at 3am.
Water: I would love to tell you 2.5l is too much, and it would be on the CF where there are fountains and bars just about every 5 km, bit on the Primitivo distances are greater, and the up and downs are greater, so ypu may require more water than walking on relatively flat Frances land.
Therés a Web site that shows you water points, take a look at it and how you think you will do: urcamino.com , I think.
And albergues never make you a snack for the next day. If you want one you have to make it or buy it the night before. The bar in Borres will prepare something for you for breakfast/lunch. Bar Lucia, I thin it's called, will give you a fruit and small sandwhich for free if you have breakfast there.
You will love the Primitivo, just don't expect the Frances commodities.