I gear up for survival and disaster prep the same way i do for the various hobbies I enjoy, though I naturally give my survival a higher priority than a mere hobby. Anyway, I basically just budget in a dollar figure monthly. For instance say $40. Then I assess what gear I alreeady have, its condition and identify/prioritize my future needs which come out of this "fund". If I identified a better knife as my highest priority then 3 months worth might go to a mini-RSK, with some left over that would either carry over to next month or maybe replace the stale snicker bars in my waist pack kit.

I hope you get the idea. How much to set aside you would of course have to decide for yourself.

Good Luck