These are often recommended:
Definitely ditch the liner. They’re usually fairly useless anyway. Plus with a 10° I doubt you’d ever really need it.
I’d wait as long as I could to buy or rent seirra gear.
I like having an extra foam pad as a sit pad, it’s nice to have it double as extra protection for the inflatable pad as well.
IMO this is the perfect food bag. I used it for the Pct, azt, and about half the cdt. It’s great. Granite Gear Air Zipsack Ultralight Zippered Pouch https://www.amazon.com/dp/B003EMSDBY/ref=cm_sw_r_cp_api_glt_i_QR4ZGXZTD84F5S1JY7RM?psc=1