Hit the dollar store. We packed "go boxes, or giveaway boxes for under 25 bucks.
We got plastic cat litter boxes, cleaned very well and packed up with stuff from dollar store.
Beans, Rice, spices (ketchup, mustard, hot sauce, seasoning, salt, etc.) canned meats, dry pasta, hand sanitizer, toilet paper, feminine hygiene products, deck of cards, lighter, matches, band aids, rubbing alcohol, hydrogen peroxide, bleach, can opener, small metal pot from goodwill, pad of paper, pens, universal phone charger with attachments, hard candies, antihistamines, small aspirin/ibuprofen.
Is enough to sustain someone for 3 days or so. Because water took up so much space we couldn't fit it in. We are looking for some inexpensive water filter but no good one yet.