DW shopped at the website
http://www.minimus.biz/ this weekend. Sees like a decent source from which to get things in small retail package, especially things that are perishable. Once you have food to eat, the next thing is makng it tasty so you want to eat it. Bulk sizes may be wasted if in a decently longterm incident.
I have no affiliations with this site, other than DW going there to shop this weekend.