This may be a bit anal, but I "portion control" my preparedness cash by vacuum packing it in increments of $200.
If I want to touch it for a particular situation, it is easier to justify borrowing a $200 packet from myself and easier to remember to replenish. Sort of like freezing the credit cards in a block of ice, you still need to find sizzors to open up a packet. I have gotten some strange looks when I can produce $200 shrink wrapped singles when the neighbors decide they want to play liars poker at 1AM.