I’ve used Grocy.

I use Grocy daily almost, but I think that is a bit more than what OP is looking for. I use it for my pantry inventory. I am somewhat of a prepper, tho I don’t prep for EOTW scenarios. Mostly for localized incidents, weather related disasters, imminent social uprisings, etc. I figure, if we start dropping nukes, point me towards the bright light and let it rip. I have no interest in ‘repopulating the earth’.

I took a hand-scanner, disassembled it, and re-assembled it into a more form fitting box and mounted it conveniently in the pantry. When I bring groceries into the house, I scan them into inventory. When I use an item, I scan it out. I also use the Grocy mobile app. So, at any time I can view my inventory and see that I either have enough of an item, or need to replenish the stock.