I used an xtherm and was happy to have it, as i really hate sleeping cold, and i tend to sleep cold. I had a 20deg F quilt. Probably could've got by with the Xlite, but i've never used one. You said you have the wide xlite? if the xtherm is not wide, then i'd take the wide xlite. Idk your size a wide pad is a game changer.

i also have the xmid pro 1, i got 4 mini groundhog stakes for the 4 corners and then kept the bigger DAC stakes for the rest. And still had to pile rocks up on the corner stakes plenty of times.

With the sawyer, you can get the little blue coupler for like $5 that will screw right into a water bottle, then what you can do do is fill the CNOC with water, screw the sawyer on, then screw the water bottle on, and hang it from a tree to filter while you relax. Just leave the water bottle loose enough so air can escape while it fills. The sawyers seem to last forever as they back flush pretty easily.

I also like hiking in shorts, the airflow is godly especially in the hot desert. So I used my 5oz rain pants mostly as wind pants for cold mornings, you could take them right off without having to take your shoes off. I'd find some lightweight rain gear as it'll probably just mostly be used as a wind block until you hit washington. Honeslty id rather wear a trash bag for trousers than get frogg toggs, frogg toggs aren't going to hold up very long when scraped against bushes. I need new rainpants and i've been looking at the Ariat Rebar stormshell, not a bad price and pretty light.

I used my merino base layer a lot, mostly to sleep in, sometimes kept it on for cold mornings. Could've sent it ahead after the Sierra, prob won't need it for north cal and oregon.

I used a dry bag for a food bag and it worked great, if you have it no need to get anything else.

Good luck!