I have a list made up that lives on my ipad and iphone. It's there more for my inventory tracking than to ref if I need something more.
Which reminds me. I'm low on 12ga trap. I think it's about to go on sale.
Likewise, I keep an inventory on my IPad, which I always have with me so I can keep track when I am out and see something that is potentially an impulse buy. Same for spare mags, spare parts, cleaning supplies etc. Sort of a running shopping list/wish list for consumables.