I started preparing while on Active Duty. I started and still do get one or two extra somethings when we go to the store.

Grocery store runs usually result in food items but there are other things in the grocery store beside food, that is important to have on hand.

Sporting goods, ChinaMart, Target, etc usually results in some equipment.

My preps, so far have come in handy during two job changes.
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QMC, USCG (Ret)
The best luck is what you make yourself!