Thanks Admins for merging the two posts.
Thanks all for your responses. I am planning on carrying 4 750 mL water bottles, and i think for most days, I will not need that volume. There is a stretch of the coast with very little in the way of places to get water though, an I am sure I will need it that one day. As someone mentioned, I dont necessarily need to fill them all every day... the first day through the SF peninsula for instance, and the last day is all down hill and very short day.
I guess my next step is to lay out what I intend to bring, and decide if I need it, want it or can go without it. Weather should be pretty stable along the coast, and this is still well before the rainy season, but it can get chilly in the mornings. As we will likely be spending more time (most days) post ride off the bikes, I need to figure that part out a bit too.