Watch Dan Rojas make distilled water from swamp water using a fresnel lens:
One thing Brandon didn't mention is glass bottles. I hoard glass bottles. Wish I had solar panels. if there's acollapse, no eleectricity for me. oh well.
for the storable food, google "Bishop's Storehouse" those are the Mormon food stores. Find one in your area. you don't have to be a Mormon to shop there.