Easy answer for me.  Paper! Any paper would do but I am partial to pattern papers, hand-made papers, papers with some weight such as card stock, velum, onion paper… I’d do just fine for the rest of my life with paper. I could even do without scissors or a trimmer of some sort, and could do without scissors.

 

I can tear the papers, and even make glue with flour. Not exactly archival but whose looking when it’s using your life time supply?