An alternative method:
1) start with what you would pack in an overnight bag for a weekend away
2) and anything unique to you; meds, tools, (think glasses) ( also your pets)
3) add food & other consumables (batteries,TP & water)
4) seasonably and region appropriate clothing
5) Paperwork (usually contained in your wallet) plus scrips, ids etc.**
6) Electronics (tablet, radio, etc)
7) comfort items

**include paper copies of things like phone numbers,etc