Hello Courtney,
I accompanied a friend two years ago on a mixed bag hunt in Northern BC. Your gear list looks good, and the only suggestion I would make is for consideration in taking a camp chair. These proved to be well worth their weight on our hunt:
http://www.backcountry.com/therm-a-rest-trekker-lounge-chair I would also check with your outfitter to ensure the guide will be given (or has) a good spotting scope. The outfit we went with provided the guide with a spotter, but it definitely had seen better days.
The two times I was in Northern BC the outfitter gave no consideration for water purification, and so Kaboku's recommendation is spot on.
You are in for a trip of a lifetime and I am excited to hear how it went. If you are interested, here is a short film of my friend's 2013 goat hunt:
https://www.youtube.com/watch?v=QHxZksCxtQoTake Care,
Levi