Time for some direct words:
I am really curious about how your experience allows you to make this "very reasonable" claim.
Your exact $114 is based on various uncertain items and the even more vague "very nice" hotels.
Let me claim Euro 65...
Start easy and build up your kms over the first week or 2. Don't over do it at the beginning. You might not even finish at Santiago but in the big picture of life that is less important than damaging your body and mind by overdoing it
These can only be personal perceptions and relevant to each person's walking experience and other matters. For example, if you have started walking from Le Puy that is different from starting "cold" at St Jean. - starting in a fully fit...
Or, carry the well fitted backpack with hip belt and offload heavier items not needed during the day to a lightweight duffel or other bag to be sent ahead.
@J Willhaus has recommended this one from Amazon:
Multipurpose Pocket Size 30L Packable...
It might be worth it to get a SIM card. This worked well for me. For example, Orange offers one that gives you 100GB for 20 Euro for 28 days. Vodafone has a number of options from 100GB for 15 Euro for 28 days up to 190GB for 40 Euro for 28...
Forget the time zone complications, just think about sunrise and local "solar time". On hotter days try and start walking about 20 minutes before sunrise "local dawn" when you can see just enough to be able to walk without a headlight or...
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